
Image by Getty Images via Daylife
Every time you fill up, just record your mileage, how gallons you put in, and the cost per gallon. When you get home you can enter the info on Fuelly's website and you'll start to see some trending after a while.
It's even easier if you have a mobile phone with web access, so that you can enter everything at the pump. Adjust your driving habits to see the effects over time.
Fuelly
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