Originally Posted by feets
...Back in 2001 we did one of the prototype TKO transmission swaps in a 70 440+6 RoadRunner with 3.54 gears. On the drive from Dallas to the Nats he got 17 mpg at 65 mph and 18 mpg at 75 mph. We think the engine was being lugged down too much at the lower speed.


I bet with 4.10+ gears and the same cruise RPM that was used @ 75 would net some good MPG gains drive

440, 4-Speed, 3.54
1968, when Dinosaurs ruled the Earth