Adamant1971

Yep, my 87 5spd 2.2 rear gets 23 mpg on long highway trips as long as I don't enjoy the loud pedal too much.

Pete in DC

Can I suggest the Search function? Many of your questions have been asked and then answered, in great detail, by very knowledgable 928 experts, users and others for more than 20 years -- that's how I learned the fundamentals before moving from 911s to a 928 S4. Not trying to be rude. More that this is the most informative "message board" I've ever been on -- it's all already there -- and you can access the answers, the demos, the DIYs whenever you want.