i use the gas cubby ap for iphone. you enter your mileage of your car every fill up, and how many gallons /cost per gallon and some other info. long story short it tells you your avg fuel eceonomy overall. i get 19.1 with 50/50 city/highway. i'm content with that. my altima i got 24 mpg overall. 5 mpg less for much better performance and all around car. the way i see it is. if i have a car that slurps 93 octane gas i shouldn't be overly concerned with mpg.
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