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With that low of shift rpm, your probably accelerating for a long time, by dragging it out, you are staying in 1st and 2nd a long time where mpg are terrible, accelerate faster to get into D/OD and lock up the torque convertor.
With my Stratus with a 2.4 3,000 rpm worked well, 1/2-3/4 throttle to 3,000 rpm, left off to get it to shift, back on as hard as I could without making it to down shift. With my auto tranny it is real hard to get 70% load after 1st gear because it will down shift. So thinking about % load has no value.
Shift light on my Cobalt is at 2k, but it's a manual, so I can load the engine for greater efficiency, but sometime like accelerating up hill, it think it's better to get to 55 in 3rd and then jump to 5th than take 2x long to get to 55 if I shifted by the light. 55 rpm = 2k.
Best mpg gains are really on the other end of the road when you need to stop, a good coast = better mpg and brakes last longer.
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