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I have a vacuum gauge installed on my 1997 Corolla (1.6L, 3 speed automatic). It is useful for giving me an indicator of how hard my engine is working (and thus how much extra fuel I consume).
I find myself holding the transmission in 2nd gear for better acceleration as my 3rd gear is pretty much a freeway only gear. (Imagine a 5 speed, that only has gears 2, 3 and 5) When in "D" it will shift from 1st to 2nd at 11 MPH and 2nd to third at 25 MPH, unless I over-ride it. I use the vacuum gauge to make sure I am not pushing too hard on the gas pedal before my upshift.
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