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Originally Posted by LostSouthernStar
So our cars perform better at 60 versus 50-55???
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No.
If you can cruise at 50 without constantly unlocking the torque converter or kicking down a gear (due to hills, for example) you will get better fuel economy there.
I think you're overestimating the speed at which your torque converter locks in top gear. It's likely closer to 40-45 than 50.
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I have a very, very difficult time maintaining a constant speed with my Camry due to its sensitive accelerator, that's why I've used cruise control...
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Cruise control is fine if (a) you drive on dead flat roads, or (b) you're unable to modulate the pedal smoothly & consistently on your own.
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Would switching to synthetic oil, a K&N air filter and changing my fuel filter result in better fuel economy???
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Miniscule difference; no difference; no difference.