It's no secret that a Duramax diesel is not known for fuel economy. But there is more than one way to increase the fuel economy on a Duramax diesel and save money on gas. And while these modifications won't give you the gas mileage of a small commuter car, you can increase your fuel economy from three to six miles per gallon.
Purchase a chip for your vehicle's computer. Different types of plug-and-play computer chips come with specifics for installation.
Upgrade your exhaust system at a professional exhaust shop.
Convert to at least a 4-inch exhaust pipe and change the down pipe from your turbo if you choose to upgrade your exhaust.
Buy do-it-yourself kits that come with instructions for propane injection and water-methanol injection or have these modifications done professionally.
