The Unit Your Accounting Does Not Have

Think about how vehicle cost actually gets measured in a small business.

The IRS business standard mileage rate is per mile. It is currently 76 cents, raised from 72.5 cents in a rare mid-year adjustment effective July 1, 2026. Reimbursement is per mile. Fuel economy is miles per gallon. Depreciation schedules and resale comps for trucks are quoted in odometer miles. Even the rough mental math most owners run, "that truck costs me about sixty cents a mile," is a per-mile figure.

Every one of those measures reads zero during an idle hour.

The engine is running. It is burning fuel, accumulating heat cycles, contaminating oil, loading the exhaust aftertreatment, and consuming service life. And the odometer, which is the denominator for essentially all of your vehicle cost accounting, does not move.

So the cost is real, it is continuous, and it lands in a blind spot created by the unit of measure itself. You are not failing to manage it. You are missing the instrument that would let you see it.

The instrument is engine hours. Heavy equipment manufacturers figured this out decades ago, which is why a skid steer has an hour meter and a resale listing quotes hours instead of miles. What most companies have never done is extend that logic to the pickups, dumps, and service trucks that spend just as much of the day sitting and running.

What an Idle Hour Actually Burns

Start with fuel, because it is the most measurable piece and because the price moved hard this year.

As of August 10, 2026, the U.S. Energy Information Administration puts the national average on-highway diesel price at $5.257 per gallon. That is up $1.503 from a year earlier. Regular gasoline sits at $4.006, up 88.8 cents year over year. Diesel has moved roughly 40 percent in twelve months.

Every idle hour you were tolerating last summer costs meaningfully more this summer, whether or not anything about your operation changed.

Now the burn rates. The U.S. Department of Energy, drawing on a worksheet developed by Argonne National Laboratory, published idle fuel consumption rates by vehicle type with no accessory load. Compact sedans with 2.0 liter engines consume roughly 0.16 to 0.17 gallons per hour. A large sedan with a 4.6 liter engine burns just over twice that. A transit bus consumes nearly a full gallon per hour. Research using DOE, EPA, and Argonne idle consumption data assumed light-duty trucks at about 0.84 gallons per hour with no load and 1.10 gallons per hour under load.

The pattern is straightforward: displacement and load drive the number. A loaded diesel work truck or a compact track loader running hydraulics is at the high end of that range, not the low end.

At national scale the totals are large. Argonne reports that idling in the United States consumes more than 6 billion gallons of fuel annually, at a cost of more than $20 billion to consumers and businesses.

The more useful finding for a contractor is a different one. Argonne research on commercial trucks concluded that workday idling is potentially a much larger energy user than overnight idling, with conservative estimates putting workday idling alone near 2.5 billion gallons a year, about 7 percent of the fuel used by those trucks.

Read that again in the context of your own operation. The idling that matters most is not a truck sitting overnight. It is the engine running at 10:30 on a Tuesday while work is happening around it. Which is exactly the idling nobody schedules, nobody notices, and nobody measures.

Be Careful With the Engine Wear Number

Here is where this topic needs some honesty, because there is a number circulating in fleet marketing that does not hold up, and you should not make a purchasing decision on it.

You have probably seen some version of "one hour of idling equals 30 miles of engine wear." Depending on which article you read, the figure is 25 miles, 30, 50, or 80. Occasionally it is presented as tens of thousands of miles of wear per year with a matching four-figure maintenance cost.

Those numbers mostly trace back to older estimates that were subsequently revised down, hard.

Argonne addressed this directly. Its analysis notes that the Technology and Maintenance Council assesses engine wear proportional to fuel consumed, which puts one hour of idling at about 7 miles of equivalent wear for a truck getting 7 miles per gallon on the road. The report explicitly flags that older estimates equated one hour to 80 miles, and that the discrepancy is explained by reductions in fuel sulfur and changes in idling engine speed. Argonne's own text notes that previous estimates of maintenance savings were considerably higher than what the revised figures support.

The National Academies, in its review of technologies for reducing fuel consumption in medium- and heavy-duty vehicles, is more conservative still: every hour a truck idles unnecessarily is equivalent in fuel consumption to about 4 to 5 miles of driving and adds an estimated 15 cents in maintenance costs.

Fifteen cents an hour is not a dramatic number, and we are not going to pretend it is. Across a five-machine fleet at three idle hours a day for 250 days, it is a bit over $560 a year in maintenance. Real, worth having, not the headline.

The fuel is the headline. At the current EIA diesel average, one gallon an hour of idle across that same 3,750 machine-hours is roughly $19,700 a year. The maintenance effect is a rounding error against the fuel cost, and any vendor leading with a four-figure per-truck maintenance claim is selling you a number the underlying research walked back years ago.

We would rather you buy on the number that survives scrutiny.

Hours, Not Miles: The Maintenance Interval Problem

There is a second effect that has nothing to do with wear-per-hour debates, and it is more concrete.

Service intervals on equipment run on hours. Your skid steer's oil change is at 250 or 500 hours depending on the machine. Hydraulic filters, air filters, and coolant service are all hour-based. Manufacturers set those intervals in hours precisely because engine time, not distance, is what consumes service life.

Which produces a practical failure that costs real money on both ends.

If your maintenance scheduling for trucks is mileage-based and those trucks idle heavily, you are under-servicing them. The oil has seen far more engine time than the odometer suggests. Idling runs an engine cool and rich, which is exactly the condition that degrades oil fastest, and a mileage-triggered oil change arrives late every single time.

Run it the other way and you get the opposite waste. If you service on the calendar rather than actual hours, machines that barely ran get serviced on schedule anyway, and you pay for fluid and filters and shop time you did not need.

Both errors come from the same root cause: nobody has the hour data for the assets that do not have hour meters, and nobody is reading the hour meters on the assets that do.

There is a resale dimension too. When you sell a compact track loader, the buyer asks for hours. A machine carrying 600 hours of unnecessary idle time on the meter is worth less than an identical machine that was shut down at lunch, and neither you nor the buyer has any way to tell how many of those hours were productive. That difference was created in twenty-minute increments across four seasons by nobody in particular.

Where the Hours Actually Go

When companies start measuring engine time against work time, the same patterns turn up.

Lunch. The single largest recurring block. Thirty to sixty minutes a day, every day, on every machine that nobody walks back to shut off. On a 200-day season, that is 100 to 200 hours per machine.

Warm-up that became habit. Diesels genuinely need some warm-up, especially in cold weather. What starts as five justified minutes in February frequently persists as twenty unexamined minutes in July.

Staging and repositioning gaps. The machine is running because it will be needed again in "a few minutes." Those few minutes stretch while material gets moved by hand, a measurement gets checked, or the crew waits on a delivery.

Climate control in the truck. This one is legitimate and you should be careful how you handle it. A crew truck running AC in August or heat in January is a working condition, not waste. If you attack it as waste you will damage morale over a modest fuel saving. Measure it, understand it, and treat it as a real cost of doing business rather than a target.

The end-of-day tail. Loading, cleanup, and paperwork with everything still running, then a return to the yard where machines idle while the trailer gets unloaded.

None of these is anybody's fault. All of them are habits, and habits only change when somebody can see them on a report.

What This Costs on a Real Fleet

Illustrative arithmetic, on placeholder inputs, to show the shape of it.

Take five diesel assets: two work trucks, a dump truck, a skid steer, and a mini excavator. Assume a conservative 1 gallon per hour at idle, which sits within the DOE and Argonne range for loaded light-duty and small equipment. Assume 3 avoidable idle hours per asset per day across a 250-day working year.

That is 3,750 avoidable engine hours and 3,750 gallons. At the current EIA national diesel average of $5.257, that is roughly $19,700 a year in fuel that produced no work. Add the National Academies maintenance figure and you are near $20,300.

Cut it in half and you have recovered about $9,850. Not by working harder, buying anything, or asking a crew to do more. Just by knowing which machines are running when nobody is using them.

Those figures are illustrative arithmetic on placeholder inputs, not survey data or measured results. Your fuel price, your burn rates, and your genuine idle requirements are all different, and some of your idle time is legitimate. The structure of the math is the transferable part: engine hours times burn rate times fuel price, on a quantity nobody is currently counting.

Why AlerTrax Works on Equipment, Not Just Trucks

Most fleet tracking is built around vehicles with constant 12-volt power and a hardwired install. That covers your trucks. It does not cover the mini excavator, the walk-behind, the chipper, or the trailer, and in this business those assets are often where the hours pile up.

AlerTrax was built for the assets everything else skips.

• Battery Powered, No Wiring Required: Two AA batteries, over a year of life. Nothing to splice, no OBD-II port needed, so the same device works on a truck, a trailer, a skid steer, or a mower.
• Location and Movement History: See when an asset arrived at a site, how long it stayed, and when it moved, so you can compare asset time on site against the hours you are being billed and the hours you are billing.
• Automatic Time-on-Site Logging: Every arrival and departure timestamped, with no crew input and nothing to remember.
• Trip Reports You Can Export: Date range by asset or across the fleet, with duration and distance, in a table you can actually reconcile against fuel cards and shop invoices.
• AddressFence: Address-based arrival and departure alerts for specific properties and yards.
• Geofencing and After-Hours Movement Alerts: Virtual boundaries around the yard, storage lots, and job sites, with instant notification on entry, exit, or movement outside expected hours.
• Live Fleet Map: Every tracked asset on one screen in the AlerTrax Fleet Portal, with updates as often as every two minutes.
• 100% Waterproof, Ruggedized Housing: IP67 rated, built for mud, rain, dust, and pressure washing.
• iOS and Android Apps: Full access to the map, alerts, and history from the field.

One thing worth being straight about: AlerTrax is a GPS asset tracker, not an engine telematics module. It is not wired into the machine's ECU, so it reports where an asset is and how long it has been there rather than reading an engine hour meter directly. If you need true engine-hours-from-the-ECU on every machine, that is a wired telematics install and a different product category.

What AlerTrax gives you is the asset-level time and location record that makes idle visible in the first place: which machine sat where, for how long, and whether that matches the work that got billed. For most landscaping and hardscaping operations that is the missing layer, because the alternative is currently nothing at all.

What It Costs

You can put AlerTrax on your fleet for $49.99 per month over 12 payments, with no long-term contract and no hidden fees.

(Prefer to own it outright? There is a $599 Lifetime option for permanent, subscription-free tracking.)

Against the illustrative fleet above, recovering even a third of the avoidable idle fuel covers tracking on all five assets several times over. And unlike most operational fixes, this one does not require anybody to work faster.

And Yes, It Protects the Equipment Too

This article is about hours, but the same device does the obvious job. Skid steers, mini excavators, and trailers are among the most-targeted assets in the trades, and they usually sit unattended on open job sites overnight.

Geofence the site and the yard, set after-hours movement alerts, and if something moves when it should not you get a live location within minutes rather than discovering an empty pad at 6:30 the next morning. It is why most owners look at trackers to begin with. It is just not the reason the good ones keep them.

Start Counting the Hours

Diesel is up more than a dollar fifty a gallon in twelve months. That single fact has quietly repriced every idle hour in your operation, and nothing on your P&L broke it out for you.

You do not need to run a campaign against idling or put a stopwatch on your crews. You need to know which assets are sitting where, for how long, and whether it matches the work that got billed. Everything else follows from having the number.

Miles will never show it to you. Hours will.

Visit www.buyalertrax.com to put location and time-on-site tracking on every truck, trailer, and machine you own. Questions? Reach us at sales@buyalertrax.com or call 800-240-6533.

Sources

U.S. Energy Information Administration, Gasoline and Diesel Fuel Update (released August 11, 2026): U.S. on-highway diesel national average $5.257 per gallon as of 08/10/26, up $1.503 from a year earlier; U.S. regular gasoline $4.006 per gallon, up $0.888 year over year
Argonne National Laboratory, Reducing Vehicle Idling: Idling in the United States consumes more than 6 billion gallons of fuel annually at a cost of more than $20 billion to consumers and businesses
Argonne National Laboratory / Gaines, Vyas, and Anderson, Estimation of Fuel Use by Idling Commercial Trucks: Workday idling determined to be a potentially much larger energy user than overnight idling; conservative estimates yield nearly 2.5 billion gallons annually, about 7 percent of fuel used by those trucks
U.S. Department of Energy, Fuel Consumption at Idle for Selected Gasoline and Diesel Vehicles: Based on an Argonne National Laboratory worksheet. Compact sedans with 2.0 liter engines approximately 0.16 to 0.17 gallons per hour at idle with no load; 4.6 liter large sedan just over twice that; transit bus nearly 1 gallon per hour
DOE, EPA, and Argonne idle consumption rates as applied in published life cycle research: Light-duty trucks at approximately 0.84 gallons per hour with no load and 1.10 gallons per hour with a load
Argonne National Laboratory, Analysis of Technology Options to Reduce the Fuel Consumption of Idling Trucks (ANL/ESD-43): Technology and Maintenance Council assesses engine wear proportional to fuel consumed, placing one hour of idling at approximately 7 miles of equivalent wear at 7 mpg; older estimates equated one hour to 80 miles; previous estimates of maintenance savings were considerably higher than revised figures support
National Academies (National Research Council), Technologies and Approaches to Reducing the Fuel Consumption of Medium- and Heavy-Duty Vehicles, Chapter 6: Every hour a truck idles unnecessarily is equivalent in fuel consumption to about 4 to 5 miles of driving and adds an estimated $0.15 in maintenance costs
Internal Revenue Service: 2026 business standard mileage rate set at 72.5 cents per mile effective January 1, raised to 76 cents per mile effective July 1, 2026
Illustrative arithmetic: The five-asset fleet example (1 gallon per hour, 3 avoidable idle hours per asset per day, 250-day year) uses placeholder inputs to demonstrate how engine hours convert to cost. These are not survey data and do not represent measured results from any operation. Burn rates, fuel prices, and legitimate idle requirements vary by machine, climate, and application.