i like to get a sample of my entire tank, and i drive it till the fuel light flashes,every tank. im with old tele i dont think the amount of gas makes a huge difference at least not for me (not a whole lot of stop and go) so once you get that weight moving its no big difference, my scangauge stays steady across my whole tank for the most part with me struggling to keep it above 60mpg (avg) which is about 7-9 mpg too optomistic. as far as how to fill, i fill and rock/fill and rock until no more gas will settle, and its in the filler neck. a pretty accurate method,,,,hey luvit lets aeromod that honda! belly pan and pizza pans,,,chicks digg it.