Propane / LPG Conversion Payback Calculator
See after how many miles a propane (LPG) conversion pays for itself and what you really save per year. It accounts for the higher fuel use on gas propane.
The fields are pre-filled - change them to your own numbers to see the result.
Is a propane conversion worth it
A propane (LPG) conversion pays off when you drive a lot. Propane is usually cheaper per gallon than gasoline, but the engine burns about 10 to 15 percent more of it. A kit typically costs $2,000 to $6,000 and pays for itself after tens of thousands of miles. The calculator above runs your specific case.
How much does a propane conversion cost
The price depends on the engine and the quality of the system. A basic multipoint kit runs a few thousand dollars, and newer direct-injection engines cost more to convert. Add periodic tank inspection and certification every few years on top of that.
What to watch on a car that runs propane
Buying a used car that already runs propane, check the tank certification date (it is valid for a set number of years), the quality of the install, and whether the engine was set up for gas. A poorly matched or neglected system can burn valves. We cover how to pick a fuel type in gas, diesel, hybrid or electric, and if you are new to filling one, see how to fuel a propane or flex-fuel vehicle. Check the overall condition with the MotoPPI app, see how to inspect a used car.
Frequently asked questions
After how many miles does a propane conversion pay off?
Usually after tens of thousands of miles, depending on your mileage and the price gap. The calculator works it out for your numbers.
How much more fuel does a car use on propane?
Usually about 10 to 15 percent more than on gasoline, because propane holds less energy per gallon.