Quote:
Originally Posted by ever_green
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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Here's a trick for Honda automatic transmissions. When you're at 40 mph, do a quick D-N-D shift and it should pop right into top gear. I use that all the time in the Odyssey. Once it's in 5th it will hold it down to 38 mph, you're just tricking it into thinking it was already there.