had a 92 gmc w/ a real hot 406 sbc in it, (estimate of 600h.p.) 3;73 gear, 3800 tci convertor, 30" tall rear tires, truck weighed 3500 pounds w/o me in it. 70mph was around 2950 rpm. believe it or not, I got 16.1 miles a gal. on the hiway "if" I kept my foot out of it completely. high eleven second truck too ! got so pissed off that I couldn`t keep it from leaking oil, I traded it off. think it had a hole that would open a small amount when hot .:wack:
