So here is my question, when am on the highway, my engine is at 2000rpm wether I travel at 100, or 110, and often even 120 only pushes me to about 2100rpm. Are there any "other" factor's that come into play, or am I using just as much gas at 120, as I am at 100? A friend with a accord is claiming he burns less gas at 110 than at 90, but how does that make sense?

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02 KJ "Frank The Turtle"
http://www.cardomain.com/ride/3111598

Probably has to do with the overdrive. When the overdrive locks out the RPMs drop. It doesn't have to up/down shift gears. The lower your RPMs are the less fuel the engine needs (more MPGs).

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2002 Jeep KJ Sport 3.7L 4x4

245/75-16 Mastercraft Courser HSX, 16x7 Cragar, 2" OME MD Lift, ARB Bumper
AEM Brute Force Cold Air Intake, Flowmaster Super 44 Muffler

Currently working on: Full service on transmission & bed-lining ARB bumper

viewtopic.php?f=43&t=84650

At 110 you're creating more drag so I would think that would have some impact on your MPG. How much I don't know but I'm sure there is an effect.

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-Gavin
2006 4x4 Sport ~ Dark Khaki
2.5" Rockfather II
Tow Hooks ~ HH Rear Hitch
Hella 500's

gwip Design

The only way you should have the same engine speed at 100kph and 110 kph - is if your torque converter is slipping at 100 and locked at 110. (if you've got a clutch and it's that bad it needs to be replaced)

aerodynamic effects really start having an influence about 50-55 mph (~90kph) and from there the resistance increases exponentially with speed - in an Accord - it may be aerodynamic enough that an overdrive gear at 110 cruises at a lower rpm and is therefore more efficient - but in a KJ - it'll be worse.

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2005 CRD
stuff
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