ppine wrote:
I have a big heavy F-350 with the 7.3. It gets 20-23.8 mpg empty.
My uncle Alaska Bob was a diesel mechanic for decades. He taught me the importance of getting air in and out of a diesel engine. After market air intakes (not just a different filter) and a new larger 4 inch exhaust system make a big difference.
The head pipe on my stock exhaust was 3 inch in diameter except there was a 90 degree bend that flattened the pipe. Replacing it with an after market 4 inch pipe that is totally round changed the performance of the truck.
Well thats a pretty exceptional 7.3. I too spent nearly 16 years with a 7.3 Superduty 350.
I too went 4" turbo back, AIS intake , DP tuner etc etc ect, and cracked 20 mpg, JUST once on a pretty flat secondary road at 55 mph. The rest of the time 16-18 empty at freeway speeds.
