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Old 03-04-2013, 10:18 AM   #81 (permalink)
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Join Date: Dec 2007
Location: Texas
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PaleCivic (retired) - '96 Honda Civic DX Sedan
90 day: 69.2 mpg (US)

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Originally Posted by ever_green View Post
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.
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.


11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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