Fair enough, I always prefer to have 6 gears if possible but whatever, not like another gear is gonna make a huge difference to the consumption of a 4.6 V8....plus consumption's not really somthing I was worried about :P
Don't honestly need them with a big engine (though actually all my cars have 5 speeds and I'm not convinced 6 is yet the norm). The GM cars have 6 speeds but two are overdrive. Certainly the Ford 5 speed is a million times better than the GM 6 speed in shift quality.