Right now I'm calculating FE the old fashioned method. Unfortunately for me, my car has a massive tank and I don't have $60 to just pump into it at any one time. I usually put $20 to $25 in it at a time, but any more is just too much. Unfortunately I'm also in the same boat regarding a ScanGauge. I just don't have the money to commit to buying something that isn't really a necesity (plus I'm skeptical that my monster sized car is going to improve that much anyhow, so I'm not even sure it would be worth getting if I could afford it). As well, I'm not even sure if my car is compatible for SG. How would I even go about checking for that?