Quote:
Originally Posted by Clockwork
on my '05 4.4i with a well maintained engine/tranny (as I'm sure most of you have as well), I get 531miles to a tank when cruising at 65mph. I've done that a bunch of times and its funny cause I NEVER thought I'd be able to get that. And thats not math from the RANGE either, its legit begin to end of trip mileage.
This is also in winter when gas gets sucked back more, BUT I run 255/55R18's too, so it kinda evens out I guess.
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'03 4.4 sport pkg here. I have done several runs between Dallas TX and Spring Hill FL (1100 miles, GPS verified) with a SINGLE fuel stop and showing 60 miles to empty at arrival. New fluids in trans/Xfer case/diffs (at 100k miles), tires inflated to 38 psi (I usually remove the staggered wheels and mount the "highway wheels" for long road trips, those are 255-55-18s non-stagger), no AC, windows up and speeds below 70mph. That works out to around 580 miles a tank. I've logged and calculated my mileage and regularly see over 23 MPG during highway driving when I can keep it under 70 MPH. Running at 75 MPH the mileage drops to around 20 MPG.
FWIW, I add 10 oz of Lucas Upper Cylinder Lube with each fill up, an addition $3 on a $90 fill is not noticeable. I've been using this product for over 20 yrs and have yet to have a fuel system issue on any of my vehicles.
Regular city driving in the Dallas area returns around 400 miles per tank (just now checked the OBC, 345 traveled with 53 to E)