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I use an excel spreadsheet I made for that. I set values for the car I want to compare to (25 city, 34 highway) and I insert my rough estimate of city% driving for the tank along with the cost of gas at fillup time (since I compare a diesel to a gasser).
On my TDI my fuel ecomony vs a 25/34 gasser have been a tad over 3.8¢ per mile since late july. My fuel cost per mile is just below 10¢ (we have a lot of taxes up here...)
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