Quote:
Originally Posted by mkiitmr2
Okay, So the best MPG while cruising for a particular vehicle is the speed at which vacuum is the HIGHEST?
In other words:
65mph @ 14 vacuum > 50mph @ 12 vacuum
ERIK
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You want the highest vacuum reading in the highest gear possible. Your example would mean that the 65 MPH would be best, but it's not likely that is the way it would actually work out, because you'll probably be at lower vacuum at 65 because the engine will probably be working harder to maintain 65 MPH than 50 MPH. The load on the engine is what controls the vacuum.