I'd say go for it! I own a 2012 Cruze 1LT auto rated at 38mpg highway (wish it was manual...teach the wife how to drive stick...the 6M Eco does amazing on mpg). It consistently returns better than EPA estimated mpg. I just took a 610 mile trip on a time constraint through the mountains (meaning my average speed came out to 71.8mph - usually had cruise set at 78-80) and returned 40.4 MPG. It could easily hit 45 if i drove slower. The most i've gotten out of it was 43.8mpg from a 700 mile trip with an average speed of 61.7 (there was some in town driving and sitting in parking garage traffic for 30 minutes).
Check out CruzeTalk forum. We have lots of good info over there. There is one owner of a 2012 6M eco that has kept meticulous mpg logs for 318,000 miles and i think he has a lifetime average around 44mpg or so.
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