Guide
How to track RV trip costs and real fuel economy
Most RVers have a rough idea what a trip costs. Fewer know their real miles per gallon or what a night on the road actually runs. Here's a simple way to track both without turning the trip into bookkeeping.
Last updated: October 2026 · about a 6-minute read
Tracking costs is worth doing for one reason: it makes the next trip easier to plan. Once you know your real MPG and what a typical night costs you, budgeting a trip goes from guessing to a quick multiplication.
1. Keep the categories short
You don't need twenty categories. These cover nearly everything:
- Campgrounds (and any paid overnight)
- Fuel
- Tolls
- Food
- Propane
- Maintenance and repairs
- Other
Log as you go. Receipts pile up fast, and a week later nobody remembers the toll.
2. Measure your real MPG
The only honest way to measure fuel economy is full tank to full tank:
- Fill the tank all the way and note the odometer.
- Drive normally.
- Fill all the way again. Divide the miles since the last fill by the gallons you just put in.
One stretch can be off because of wind, grades, or a pump that clicked off early. Average the last few full-to-full stretches and you have a number to plan with. Partial fills are fine for the trip, but they don't count for MPG until the next full fill.
3. Work out cost per mile and per night
- Cost per mile is total trip cost divided by miles driven. It's the number to compare trips that cover a lot of ground.
- Cost per night is total trip cost divided by nights. It's the number to compare slow trips and full-time months.
Both are more useful than a total, because they let you budget a different trip. If last summer ran a certain amount per night, a trip twice as long will run about twice that, plus the extra fuel.
4. Use it when you plan
Plug your real MPG into the next trip's fuel estimate, and look at what you spent per night when you pick stays. See how to plan an RV trip for budgeting before you leave, and fuel stops for big rigs for range.
How RV Compass tracks it
Log fill-ups from the Garage in the phone app as you go. RV Compass measures your MPG from full tank to full tank over your last five stretches, and one tap on Use measured puts that number on the rig so fuel estimates and range use it.
Each trip has an expenses section with campground, fuel, toll, food, propane, maintenance, and other lines. Fill-ups on the trip show up as fuel lines automatically. You get totals by category, cost per mile on the miles you drove (or the planned miles before you go), and cost per night. Your lifetime travel stats and Year in Review add up the miles, nights, and states. More in your year on the road.
Frequently asked questions
How do I calculate my RV's real MPG?
Fill the tank all the way and note the odometer. At the next full fill, divide the miles driven since the last fill by the gallons you just pumped. Average several of these full-to-full stretches, since wind, grades, and pumps that click off early can throw off any single one.
What does an RV trip cost per mile?
It varies a lot with the rig, fuel prices, and where you stay, so the useful number is your own. Add up everything the trip cost (fuel, campgrounds, tolls, food, propane, maintenance) and divide by miles driven. Track it for a trip or two and you'll have a figure to budget with.
What expenses should I track on an RV trip?
Campgrounds, fuel, tolls, food, propane, maintenance, and a catch-all for everything else. That short list covers nearly everything without turning the trip into bookkeeping.
Does a partial fill-up count toward MPG?
Not on its own. A partial fill doesn't tell you how much fuel you used. Log it for cost, then measure MPG at the next full fill, counting every gallon added since the last full tank.
Know what the trip really cost
RV Compass is live on the web and on iPhone. Start planning free on the web, then take the same route on the road with the iPhone app.
Start planning freeSign up with email on the web, or with Apple, Google, or email in the app.