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Solid is right with the driving habits, that's the single most thing you can do to increase mileage.
There's a ton of tips out there on how to drive and things to do, but really, they're all based on inconveniences that you're going to have to put up with to achieve better MPG.
Some of the more ridiculous driving habits include:
Try not to go over 3,000rpms
Never slow down if you don't have to (don't excessively use the brakes, let others speed ahead to the next stoplight so they might activate the sensor to turn the light to green)
Don't slow down on offramps, the velocity you enter it will keep your speed up, meaning you won't have to accelerate out of it
Try to drive as close as legally possible to other cars on the highway (the bigger the better) Your engine won't be under as much load because it's not having to struggle against wind resistance
Don't ever let your car idle, ever (0mpg) Remember that your car uses the same amount of fuel to idle for 10 seconds as it does to turn it on.
If running multiple errands, go to the farthest destination first, it will give a chance for your engine fluids to warm up to operating temperature (where it operates most efficiently) and it will stay that way as you keep starting the car and turning off the car the closer you get to home.
Let your car coast as much as possible, coasting means the injectors are off. Don't coast with your car in neutral, the injectors turn back on.
Use cruise control for more efficiency
Now for the ridiculous modifications you can do:
Get tires specifically made for low rolling resistance (although performance will suffer). This is the single biggest area your engine uses power for.
Decrease engine rotational mass and unsprung mass i.e. underdrive pulleys, lighter flywheel, take out balance shafts, take off the A/C (or disconnect belt in winter months if you must have it) drill your rotors for less weight and mass, get lighter weight wheels and skinnier tires
Get light, take out everything you don't need (a big pain in the ass if you do this with seats) replace things that weight alot with something lighter (hood, battery, trunk)
Switch to a motor oil like 0w-30 for a little bit more efficiency.
Get a K&N panel filter for your stock intake, always keep it clean
Get a ground wire kit
Maybe try those new enerpulse "pulse plugs" They ensure a more complete burn in the combustion chamber, therefore, less fuel will be used.
I'm not saying all of these things are totally practical to do (or legal or cheap), but if you want MPG increases, these are the steps you should take.
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