Quote:
Originally Posted by UFO
That map was not done figuring in wind resistance?
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So far as I can tell.
OTOH I average 24 mpg, empty or loaded (up to 2k payload) across Gulf Coast Texas with some fairly stiff winds depending on the time of year. My motor has a slightly higher rating than that one, but is an otherwise similar truck. The times I have chosen to run 68 mph show about 22 mpg with no adverse winds. I have not come across anyone getting 24 at 70 in a CTD. At 60, yes, numerous instances.
The purpose of this graph was in discussion of timing advance changes to improve FE. (Mine is stock).
Maybe my truck would do better with a timing change, but I'm loathe to add a tuner at this point.