i imagine they figured out how the epa test worked and did a little magic on the ecm to make sure the turbo is not in play for 85% of the epa driving conditions. if you like hearing the little fan go whiiiiirrrrr, then mileage starts dropping rapidly.
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GM had cleverly put over 130 miles of interstate between us and a warm meal when they handed over the keys
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what do you want to bet the starting point was at a much higher elevation than the finish point. you don't get max mpg climbing mountains, but coasting back down them is another story. And of course this is in feb/january when one is running the heater and not the A/C-good for -3mpg on most small cars.
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we saw that number dip to 41.8 with an average speed of around 65 mph
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drive that pup like a normal person up around 75mph and tell us what you get..
my last 3 new cars were chevys. [my yaris was used] i want to buy another new chevy for $20k but i want it to be a camaro, not an econobox.