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Old 05-02-2012, 11:10 PM   #7
Red Sleeper
 
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Name: Red Sleeper
Title: Too Much Time
Status: Not Here
Join Date: Aug 2009
Location: Lone Star State
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Posts: 4,582
Phil, just wait for EFI. I bet you'll be surprised at the increase.. Till then, keep clean filters, wax the paint and coast more often.
I was getting low to mid 16's with my 05 when I first bought it, deleted the cat and put a 30hp smarty tune on it. That bumped it a solid 1 mpg. I can pretty much bank on 17.3 mpg now. That's roughly 60 miles a day at 70% highway, keeping the speed in the 60-65mph range, running windows 3-4'' down and no a/c. I have 3.73's and 285's.
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Nick J
'14 Silverado LTZ 5.3 4wd
'05 Cummins QCSB 4wd 48re
'91 Cummins w350 5spd
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