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Originally Posted by eslai
I really wish I knew how you guys are getting fuel economy in the 20's...
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You keep your gall fill up receipts and write your mileage on them. Then create a database and track you mileage, how many gallons you put in the car since you last fill and your new mileage on your next reciept. Once you have 2 receipts you can calculate your last trip from the first mileage record to the second and how much gas you put in the car the second time and see you traveled X miles with X galons of gas give you miles/galon of whatever. Then everytime you fill up just add it to the database and you can see exactly what your MPG was for each time you fill up.
You can then make your database do other things like average miles per fill up, average price of a gallon, average MPG and stuff like that as well.