The Ford 4.2 L V-6 engine is a modern Ford automobile and light truck motor available in many current models. They were rated between 15 and 20 miles per gallon fuel economy, depending upon city/highway driving and whether the vehicle was a 2-wheel drive or 4-wheel drive model. Getting better gas mileage out of the 4.2 only requires tested and proven driving and maintenance methods that can be done by anyone.
Tune up the 4.2 engine at recommended Ford maintenance intervals. An un-tuned engine will decrease fuel consumption between 10 and 20 percent. Although backyard mechanics can change things like spark plugs and filters, a modern Ford 4.2 is a computer-controlled engine that needs professional tuning to get the job done right.
Change your oil and replace the filter. Fresh oil reduces the friction inside of the 4.2, and reduced friction always equates to better fuel efficiency.
Drive to save. Don't rev the engine and don't idle it for long periods of time. Don't speed and use the cruise control, if applicable, on a regular basis.
