How many miles per gallon does a school bus get? Measure yours, then cut the fuel bill

Fuel is one of the biggest bills a school bus company pays, so it's natural to ask: how many miles per gallon does a school bus get? The honest answer is that it varies a lot — a full-size diesel bus on a stop-and-go rural route and a small gas bus on a short suburban run can be far apart, and two identical buses on different routes won't match either. A number from someone else's fleet won't tell you much about yours.

What you can do is measure your own — bus by bus — from a simple fuel log. This guide shows how, how to turn it into a school bus fuel cost per year, and where the savings usually are.

Why school bus mpg varies so much

• Bus size and weight — a full-size Type C or D bus moves far more weight than a small Type A.
• Engine and fuel — diesel, gasoline and propane buses use fuel differently, and an engine's age and tune matter.
• The route — dozens of stops, hills, traffic lights and school-zone crawling burn far more than open road.
• Idling — every minute the engine runs while the bus is parked is fuel with zero miles.
• The driver — hard starts and hard braking cost fuel on every stop.
• Maintenance and tires — under-inflated tires and overdue service quietly lower economy.
• Season — winter warm-ups, heaters and defrosters add idling time.

That's why the useful question isn't "what does a school bus get?" but "what do my buses get, and which ones are worse than they should be?"

How many miles per gallon does a school bus get in your fleet?

You can work it out from your own fill-ups. All you need is the odometer at every fill:

1. 1Fill the tank all the way and write down the odometer.
2. 2At the next fill-up, fill it all the way again and write down the gallons and the odometer.
3. 3Miles driven = this odometer − last odometer.
4. 4Miles per gallon = miles driven ÷ gallons added.
5. 5Do it for every fill and every bus. After a month, each bus has an average you can trust more than any single fill.

A printable fuel log has the columns ready. Our post on how to track fuel use per bus goes deeper into spotting a bus that's using more than it should.

From mpg to school bus fuel cost per year

Once you know your miles per gallon, the year's fuel bill is simple arithmetic:

• Gallons a day = buses × miles per bus a day ÷ miles per gallon.
• Cost a day = gallons a day × price per gallon.
• Cost a year = cost a day × the days your buses run.
• What a price change does = gallons a year × the change in price.

Here's an example with round, made-up numbers — not a typical fleet:

The free fleet fuel cost calculator does this as you type: enter Buses on the road, Miles per bus a day, Days a year, Fuel economy and Price today, plus What if it changes by, and it shows gallons and cost per day, month and year, the cost per bus a year, and what the price change would add or save. To see fuel next to tires, insurance and the rest, try the fleet cost per mile calculator and our guide to school bus cost per mile.

How to reduce school bus fuel costs

• Cut idling. Set a clear rule for warm-ups and waiting at schools. Many states and cities already limit how long a school bus may idle — check yours and train drivers on it.
• Check tire pressure weekly. It's the cheapest fuel saving there is, and it's good for tire life and safety.
• Keep up preventive maintenance. Air filters, injectors and brakes that drag all cost fuel. A preventive maintenance schedule keeps them from slipping.
• Look at deadhead miles. Miles from the yard to the first stop and back are paid for in fuel too. A bus parked nearer its route, or runs paired better, can save more than any driving tip.
• Coach smooth driving. Gentle starts and early, steady braking add up over dozens of stops a day.
• Watch the outliers. When one bus's mpg drops compared with its own past, or with a similar bus, find out why — a leak, a dragging brake, a habit, or fuel that isn't going into that bus.
• Budget for price swings. Run the calculator with a higher price so a jump doesn't surprise you, and read your district contracts for any fuel adjustment terms.

Doing it in FleetCommander

FleetCommander's Fuel page records each fill-up — Log fuel asks for the vehicle, date, station, gallons, price per gallon, odometer and how it was paid, with an optional photo of the receipt. From the odometer it works out MPG and $ / mi for each fill, and the top of the page shows Fuel cost, Avg price / gal, Fleet MPG and Fuel cost / mile for the dates you choose. Import CSV loads many fill-ups at once. Under Reports, Fuel consumption and Vehicle costs break it down by bus.

The in-app Calculators page has the same fuel cost calculator, and Use my numbers fills in your fuel price and miles per gallon from your own fill-ups — so your budget starts from what your buses really do. The website's fleet fuel cost calculator works without an account.

You can also ask Ava (Beta), the assistant built into the app: Which bus used the most fuel last month?, Fuel this month vs last month or How much did we spend at the pump this month? She gives the answer and links the page with the details. You can log a fill-up by saying Log 20 gallons for bus 102 at $3.89 — she shows a card first, and nothing is saved until you confirm.