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Had a neighbor regularly got 27-mpg with his 6.2 4WD Suburban. His father a GM exec, and son no dummy. Quizzed him on it. A friend got same with first year 6.2 pickup. Both automatics c
My 4T 2WD Cummins will also see 27-mpg. Stock. 58/9-Mph. On cruise control.
All of these in south central US. LSD, not ULSD.
I see mpg gains with both Power Service and Howes Meaner Cleaner. Not big, but adds to margin.
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