Quote:
Originally Posted by Shawn D.
That sort of test is useless. You can't extrapolate from a no-load situation to a loaded situation by simply adding friction and drag. Throttle position, manifold vacuum (or pressure), ignition and fuel mapping, combustion temperature, and pumping losses will all be significantly different.
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(My wrighting is't as clear as my thinking)
Yes with all of the accessories running in the car. If he knows the van will run 1,800rpm test it there. From the testing he'll know "the best possible is Xmpg".