Snowflake

http://oee.nrcan.gc.ca/transportatio...ut.cfm?attr=16

This should make it easier for everyone to figure all three.

flanneljunkie

Simple is good, and that's just a simple calculator to give someone useful information who wouldn't otherwise know how to calculate MPG. Good post, but the boards are getting pretty damn full of MPG threads. Prepare for some flack.

I use fuelly.com. Does the same thing, but saves all of the information and shows me neat little graphs.