Yes Chuck, it's because of the gear ratios. At 70 mph, I'm only turning about 1800-1900 rpm. So your engine is spinning 21% faster than mine is, and undoubtedly using more fuel than mine is.Chuck C said:now wait a sec...I thought greater hp meant less rpm at the same speeds. but as jason pointed out, his SLS at 80mph runs at 2k rpm while an STS would be at 2,500. Is this b/c of the gears ratios?
I know my Eldorado at 70mph runs about 2200-2300 rpm