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With a 3.2L Acura TL i used to get better mileage driving at 45mph vs 40mph. This was because i could upshift the automatic tranny to 5th gear at 45mph. The TCU doesn't allow 5th gear below 45mph. This let me cruise at 900-1000rpm achieving 40-45mpg whereas at 40mph i was cruising at 1750rpm and getting 35-40mpg.
So it depends on transmission/gearing and engine/torque.
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Last edited by ever_green; 03-03-2013 at 04:11 PM..
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