[JL8Jeff]

I write down the miles every time I get gas. I write down the oil changes, the other mods, brake jobs, tires, rotation, etc. A single "fill up" can give you a misreading if they don't top it off all the way. So writing down every mile and every bit of gas will give a good average. I averaged 17.5 mpg over 45K miles on my old 93 Z28 and I'm averaging almost the same with my 2000 SS with 12K miles so far. My daily drive barely gets up to 50 mph for about 2 minutes so it's easy to see why I don't average better. But my highway trips usually pull down 23-25 mpg with the A4.