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on a recent trip to the NJ shore (about 80 miles), i noted mileage of 32.7 mpg (eco mode, average speed ca. 75 mph, no bumper -to -bumper traffic). now this was exceptional to me, and significantly better than that claimed by GM. of course, to even things out, most of my driving is city driving--20 to 30 mph. in my last look-see, i noted 14.1 mpg, shown on the "last 50 miles" gauge. oh well.
 

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Perhaps, the C7 is an "economy" driver. Two weeks ago my Z51 auto (mostly touring mode) achieved 32.4 mpg on a 600 mile trip to Akron and 31.7 mpg on the return 600 miles. Used cruise mostly set speed limit plus 5. My "best" 50-mile average was 34.4 mpg. Amazing.
 

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Last weekend, we went to Bloomington Gold, which is a 6 hour trip each way and about 430 both directions. I made it home on one tank of fuel and averaged about 30 miles to the gallon.
 
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