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gas efficiency

  1. My average pure Gas economy is under 30mpg...Why?

    Generation 1 Volt (2011-2015)
    After two months of owning my 2013 I descide to review my statistics from Onstar. I added the column of Pure GAS mpg by subtracting the electric miles from the total. Then dividing the remaining miles by the fuel used to find out how much is the efficiency of the ICE engine. Looking my 2013...