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Old 07-17-2010, 02:58 AM   #8 (permalink)
ShadeTreeMech
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Join Date: Apr 2009
Location: Arkansas
Posts: 870

The Van - '97 Mercury Villager gs
90 day: 19.8 mpg (US)

Lyle the Kindly Viking - '99 Volvo V70
90 day: 25.82 mpg (US)
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Quote:
Originally Posted by comptiger5000 View Post
Maybe your car is geared so that the engine is in its efficiency sweet spot at a higher speed, and the sweet spot gains enough to overcome the aero penalty.
That is the only thing i can figure. I've even tried downshifting to 3rd when going 50 to try to find that sweet spot at a "normal" speed but no dice.

I'm at a loss as to why the mpg have plummeted lately. I repaired a vaccuum leak which made the car run much smoother (it wouldn't idle, it would lope) but it seems that now my o2 sensors have faulted because the mpg dropped like a rock afterwards.
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Quote:
Originally Posted by jamesqf View Post
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.
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