I have no intention to be a teaser, I just found this thread in the Ecomodder newsletter and a few hour earlier i set a new personal record that made me both proud and slightly shocked. -My 40 year old Saab 96 got 4,3 l/100km (=66 mpg) today! -And that's a mix of 80% highway and 20% through the heart of Stockholm, the capitol of Sweden.
The Saab has a V4 1500cc carburetted stock engine with 4-speed gearbox. No engine mods, no aeromods, just efficient driving!
Well... I have been around 4,7-5 L100 (56-60 mpg) for some time now, but that dropped even lower, probably with some help from the 7% larger front tyres (225/70/15").
The big magic is a more and more extreme use of the P&G, or as I prefer to call it, Burn & Glide driving. These old saabs have a gearbox freewheel, a rather amazing little device that makes shifting gear and engine on/off a lot easier. I have done this B&G for over a year now and the starter don't show any signs of wearing out yet. Obviously I'm getting quite skilled with the driving style.