method to tell mpg w/o SG:
I have been building up my data base and developing a way that non SG owners can tell at 1/2 tank about what the mpg is for that tank. This based on the miles driven from when the gas gage is on the "F" line mark to when it's on the "1/2" mark. The difference. So all you have to do is keep an eye on it and record the two and take the difference.
Enjoy:
