i think that most cars with 6-speeds, do not have that high of a top gear that you might think. at least with subaru's, 5th gear @ 80mph in a wrx is very close, maybe within 200-300rpms of an sti, 6 gear @80mph. Basicly 3-5 gears in a 6speed are pushed closer together. another comparision is that in my sti running 85mph, in 6th, i am at around 3500rpm. while in my 92 accord running 85, in 5th, i am around 3400rpm.