Savings calculator
Gas Mileage & MPG Savings
Small habits add up at the pump. Enter your driving and see what each change is worth in dollars per year.
Quick answer
The biggest gains are driving smoothly (aggressive driving cuts mileage 15–30% on highways), slowing down (mileage drops quickly above 50 mph), removing roof cargo boxes (up to 17% on the highway) and keeping tires properly inflated.
MPG savings calculator
Enter your driving, then switch on the habits you'll change.
Gas mileage myths
Myth
A new air filter boosts MPG
On modern fuel-injected cars, a clogged air filter mainly hurts acceleration, not mileage. Replace it on schedule anyway.
Myth
Premium gas = better mileage
Only if your car requires or recommends premium. Otherwise you pay more for no gain.
Myth
Windows down beats A/C
At low speed, windows down wins. On the highway, drag from open windows can cost as much as the A/C.
Gas Mileage FAQ
Drive smoothly.
Rapid acceleration and hard braking can lower mileage by roughly 15–30% at highway speeds and 10–40% in stop-and-go traffic.
Yes.
Mileage usually drops quickly above 50 mph, so driving 65 instead of 75 mph can save around 10–15% on fuel.
Properly inflated tires improve mileage by about 0.6% on average and up to 3% compared with badly under-inflated tires, and they last longer.
Not on modern fuel-injected cars — a dirty filter mostly hurts acceleration.
It did matter on older carbureted cars.
Yes.
Idling can use a quarter to a half gallon of fuel per hour depending on engine size and A/C use.
Before you buy
Was it maintained — or neglected?
Shopping for a used car? A VIN check shows accident, title, odometer and service history — so you know how the last owner treated it.
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