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I've got a 5 speed manual 2.2 that gets 35-36 mpg at around 55-60 mph on a 4 lane highway. Well I took it on a 5 hour trip over the weekend. Running 70-75 mph on the interstate the RPMs were at almost 3000 and my mpg dropped all the way to 32. Too bad GM didn't put a 6 speed in these things.
 

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No problem at all. I used to average 53 mpg when I drove 100km each way for school if I did 90km/h. If I did 100 I would see 48-50mpg. I had a 5 speed with no cruise so it was all my foot.
 

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Yeah at 100 the readout was 6.6-6.8L/100km but actually doing the math was always higher.
 

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Or can do it yourself. If you did tons of highway with your cobalt you could always buy a transmission from.a wrecked xfe edition. However some of their improvement is from their tune.
 
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