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Old 03-11-2008, 04:59 PM   #18 (permalink)
roflwaffle
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Quote:
Originally Posted by Harpo View Post
I get twice the HP required at 70mph as compared to 55mph. I'm sure fuel flow follows that same relationship?

I guess an extra mile on a 25 mile trip to avoid 70mph traffic is almost worth it's weight in gold.
Possibly. The thing is, engine efficiency increases with load/HP, although in most cases not as fast as load/HP with speed, so in most cases it's better to drive slower in the same gear. However, if someone wants to see the full effect of the decrease in HP from 70mph to 55mph they will likely need to break up the power output into chunks to maximize efficiency.
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