in my 95 civic, I shoot for about 2500 rpm shifts. If going down hill I shift a bit earlier, uphill a bit later.
Really though when to upshift to me has less to do than when to down shift or coast. As long as you are not lugging it up to speed or getting to 55 in first then second you will do well ok. Not using the brakes is pretty much the biggest thing. Leave yourself space and coast or down shift earlier to slow down.
Run a block heater for 30 min before you depart and that will help quite a bit. My experimentation shows that on the 25mph drive of 1 mile from the house to the highway, I can go from 40something to 60something mpg (it is mostly down hill).
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