Join Date: Dec 2008
Location: Tyler, TX
Thanked 407 Times in 347 Posts
I've not driven a 6.4L any distance on the highway, but many modern EFI vehicles actually are WAY too sensative to small changes in speed (hills etc) and they constantly "pump" the throttle from too closed to too open. This will NOT improve economy.
THE biggest improvement most people can make is in terms of driving SPEED. Slower = better economy, often LOTS better.
'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).
Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote - Benjamin Franklin
I vote for LIBERTY!