Use cruise control if you have it
It’s a 4 mpg savings. Continuous up and down acceleration and braking lowers your gas mileage. Use your cruise control on the highway to help maintain a constant speed.

Turn off the AC
If you don’t have to use air conditioning, don’t. (City driving will save you more with AC off. Highway Driving is a toss up, windows down causes drag)

Don’t idle and don’t make jack-rabbit starts
It will take a couple extra minutes, but you’ll save another couple mpg.

Travel at the speed limit
Stick with the speed limit and shift to the higher gear. Every 5 mph over 60 mph will cost about 21 cents per gallon, so if you spent 2.83 per gallon, it will be as if you paid $3.04 a gallon at 65 mph or $3.25 at 70mph, etc.

Get the junk out of your trunk
The rule of thumb is for every extra 100 pounds, the vehicle uses an extra 1 mpg.

Tune it up, fix it up
Get regular tune-ups and change your oil. An improperly tuned engine hurts gas mileage by an average of 4.1%.  Changing the oil could save you up to 3%, and something as simple as replacing a faulty oxygen sensor can boost gas mileage up to 40%!

Fresh air
A clogged air filter can decrease gas mileage by up to 10%. The air filter helps protect the inside of the engine from impurities. The potential gas savings from keeping a clog-free air filter can be up to 31 cents per gallon.

Fill those tires
Make sure your tires are properly inflated. Poorly inflated tires create rolling resistance and reduce fuel economy. Properly inflated tires can improve gas mileage by 3.3%.

Watch your wheel alignment
Going in a straight line, instead of wobbling, will save gas.

Anything you can turn off, do so
Radios, fans, all these new great technologies put a load on your engine which decreases your gas mileage.