3 MPG increase during road trip!
My family and I went on a little road trip this past weekend. 3 hours of stop-free driving to our destination, and on the way home we were never more than 1 mile from the highway, plus the truck didn't sit long enough to lose significant heat. The result was over 16.9 MPG! Obviously city driving kills mileage, but I never expected this, especially since my modification list is: synthetic oil and roof rack cross bars moved to the rear. I'm really looking forward to increasing this further over the coming summer. More synthetics in the drive axles, plus new spark plugs and wires are next up.
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