Fleet ROI Calculator

How does tracking save fuel at all?

Not by itself — a GPS unit is a measurement tool, and no measurement burns less fuel. The savings come from what measurement makes enforceable: idling becomes visible and attributable, so a no-idling policy grows teeth; routes and unauthorized trips show up, so they get corrected; and drivers who know these are recorded change their habits on their own. This calculator estimates what those management actions are worth. Tracking supplies the visibility that makes them possible — but a fleet that buys tracking and never opens the reports should expect to save very little.

The savings are added from two sources, estimated separately rather than as a single blanket percentage.

Idle reduction

A vehicle burns fuel while parked and running. Light-duty gasoline vehicles burn roughly 0.5 gallons per hour at idle; heavy-duty diesel trucks and road machinery burn closer to 1.0 gallons per hour. Multiply your idle hours per day by your working days per month, then by the share of that idling you expect to eliminate once it is visible and reported on.

vehicles × idle hours/day × 21 working days × burn rate × percent eliminated

Routing and driving habits

Shorter routes, less unauthorized use, and fewer hard accelerations and speeding events reduce consumption across the miles you do drive. This percentage, defaulted conservatively at 4 percent, is applied only to the fuel you would still burn after the idle reduction above — applying it to your full baseline would quietly count some gallons twice.

(baseline gallons − idle savings) × percent reduction

Break-even

Break-even is the monthly subscription divided by your blended fuel price. It answers the only question that matters when comparing a line item to a benefit: how little has to change before this pays for itself.

What Rastrac costs

Both options carry the same $19.95 per vehicle, per month. RastracFusion activates through the vehicle's VIN and reads its factory telematics directly, so there is no hardware to buy and nothing to install. A tracking device adds a one-time hardware cost that you buy and own outright — it is not a recurring charge, so this calculator subtracts it once from the first year and never from the monthly figures. Devices are the answer for vehicles and equipment too old or too specialised to report factory telematics.

Is this estimate aggressive?

Deliberately not. At the default assumptions this works out to roughly 10 percent of the fuel a fleet actually burns, which sits inside the range commonly reported for telematics programs. Published claims run higher, and you may well do better, but a number you can defend line by line in a procurement review is worth more than a larger one you cannot. Every assumption is exposed above so you can test it against your own fuel records rather than take ours.

What this estimate does not include

Reduced overtime, lower insurance premiums, avoided theft, extended vehicle life from on-time maintenance, and reduced rental or spare-vehicle spend from better utilization are all real and all excluded here. This is fuel only, which makes it the most conservative view of the return. Many insurance carriers offer discounted rates to fleets running GPS tracking and dashcams; what that is worth depends on your carrier and loss history, so it is not estimated here.

Estimates only. Actual results vary by fleet composition, duty cycle, geography, and how consistently the reporting is used. Default fuel prices are the U.S. average retail figures published by the U.S. Energy Information Administration for the week ending 3 August 2026. They are editable above and should be set to what you actually pay.