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Old 06-23-2013, 10:37 PM   #3 (permalink)
TheEnemy
The road not so traveled
 
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Join Date: Jan 2010
Location: New Mexico
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The Truck - '99 Nissan Frontier xe
90 day: 25.74 mpg (US)

The Ugly Duck - '84 Jeep CJ7 Rock crawler
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There are a couple of things going on there.

First most engines have their best BFSC at about 2000 rpms give or take.

Second at full throttle most engines run a little rich to prevent detonation.
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