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Tips for all drivers
Drive conservatively
Aggressive driving (speeding and rapid acceleration/braking) can lower your gas mileage by as much as 20%.
Glide to stops and accelerate slowly and evenly.
Drive consistently
Spend as much time at the same speed as possible. Mileage is worst during acceleration.
Use cruise control whenever possible, but only when the roads are flat.
Slow down
Each 5 miles per hour you drive over 60 mph can reduce your fuel economy by 10%.
Don't sit idle
Idling gets 0 miles per gallon. Turn the engine off when stopped for extended periods of time.
Check your tire pressure
Keeping tires inflated to the recommended pressure can improve fuel economy by up to 5%.
Unload your trunk
The more weight you carry, the more energy required to move it.
Declutter the exterior
Remove aftermarket bug and wind deflectors, and don't bother adding wings/spoilers, these things only add drag. If you have a removeable roof rack, remove it when not in use.
Treat your automatic like a manual
When you're stuck in traffic or waiting at a long red light, drop your transmission into neutral so the engine doesn't have to strain against the torque converter.
Combine chores and trips
An engine runs most efficiently when warmed up.