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With the 3800 a SG is a must for best FE. These engines/PCM's will guzzle fuel given a chance. Be very gentle with the throttle application once you're at speed, as the TCC unlocks with quick throttle application.
I accelerate at 2000 RPM for most things since that's a good compromise between getting speed quickly and FE. Any slower wastes fuel by producing much less acceleration.
4th gear with a 3800/4T65 combination won't come until 48 mph or so. So it's either putting around at 28 mph with the TCC locked in 3rd or blasting up to 48 mph to get the TCC locked in 4th.
28 mpg highway is pretty good. I'm averaging 26 mpg doing a lot of rural 2-lane driving.
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2012 Chevrolet Cruze Eco 6MT
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