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SG is pretty good over 2 miles. I do a number of 4 mile trips through downtown Columbia every week. It's pretty accurate, within half a mile per gallon.
Like all gauges, the SG is better up until your average tank length. I've had a 600-mile tank where it was 2 mpg off. It's accurate at 450 miles/tank, though.
If your car has a built-in instant or average MPG gauge, use that to see the results. The instant MPG gauge is by far the more useful for day-to-day use. The average MPG is good for comparing driving techniques across tanks.
Those 3.4's will easily get 33-34 highway if driven sensibly, and 25-26 combined. At least that's what the indifferently maintained 3.4 in my brother's GM minivan gets.
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2012 Chevrolet Cruze Eco 6MT
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