**Updated 5/18/12**
Ok, so I've only filled up the tank twice now. Here's the way I'm calcing it:
There are 15 ticks on the fuel gauge and tank capacity is 15.3 gallons (if you look at it in quarters, the 1st 3 quarters have 3 ticks, last quarter has 6)
- That comes out to 1.02 gals per tick...