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Old 05-06-09, 09:27 AM   #63
ophic
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Default Re: Most Economical Motorway Speed?

Quote:
Originally Posted by Sid Squid View Post
Do not confuse economy with efficiency. In essence max efficiency is getting the most back for whatever you put in, max economy is simply using the least amount.
That's a bad description, Sid, although you're right.

Max efficiency = max power output for least fuel used.
Max economy = furthest distance travelled for least fuel used.

The difference is that at peak efficiency, the engine is chucking out quite a lot of power - you'd be accelerating quite hard or maintaining a high top speed, where the effects of drag would prevent good economy.

I spose it could be argued that you should accelerate using best efficiency to the best economic speed.
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