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Old 02-05-2011, 08:38 PM   #5 (permalink)
Frank Lee
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Join Date: Jan 2008
Location: up north
Posts: 12,762

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,585
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Quote:
Originally Posted by Execut1ve View Post
I'm not asking whether to drive in such a way as to keep RPM's high or low, if anyone's confused... I realize in general the engine operates more efficiently at lower RPM. But there's a difference between cruising through town at 35mph and ~1500 rpm and driving down the highway at 65mph and ~2000 rpm. I'm asking which provides more fuel econ benefit: enhancing low rpm performance or high rpm performance.
Did I not just spell it out for you?

Quote:
Frank I have definitely noticed that most performance mods for these trucks seem designed to give more high rpm power. Are there any to enhance low end torque? and which would help my fuel econ more?
Offset cam keys and RV cam grinds come to mind first.

Quote:
As an example, I am under the impression that as far as exhaust, long tube headers enhance high rpm power at the expense of low end torque while shorties do the opposite. Is that correct?
Bass-ackwards!
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