Originally Posted by kam327
I'm not just talking highway, which is a limited view. I'm talking overall. The whole point of 6-speeds or more is to have gear ratio spacing optimized for a broader range of operating conditions and better efficiency. I've seen quotes of 3-5% savings in general just for having 6 gears versus 4.
ZF says their new 8-speed transmission has two big advantages: improved fuel economy and shorter gear steps between cogs, for quicker acceleration and smoother shifts. They claim it's 6 percent more fuel efficient than their old 6-speed.
Plus I remember my 4-speed Contour turning around 2800 on the highway. The Focus is a couple hundred less than that IIRC.
Due to the gearing the DCT equipped Focus is turning right around 2600 rpm at 70 mph where as the manual is nearer to 3000 rpm at 70 due to the 5th gear being much shorter than the DCTs 6th gear.