Grab a pencil and a notebook and put them in your car.
I told you this would be easy.
Curious? I was too, but outside of this one time I got really drunk in college, I never really... Oh, you mean about the notebook. Ahem. yeah. The pencil and notebook are for recording your gas consumption. Every time you fill 'er up, be sure to write 'er down.
This will make it so much easier to track your usage. When I first started tracking my numbers for the Riot, I just took the dollar amount from my monthly budget and divided it by the average price of gas for the month. My how things change! With the constant increases in the price of gas, it's hard to calculate an accurate weekly average!
So we'll do things the old fashioned way instead. Every time you put gas in the car, write down the number of gallons (or litres or whatever) you guzzled. If you're a commuter, (yeah for you!) then write down the number of miles commuted and the type of transport used. And if you're a biker and/or walker, well, you're already ahead of the curve! Three points for you. :-)
Got other suggestions for tracking your gasoline consumption? Join the discussion at the Yahoo Group!