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I live in the country and most of my driving is 2 lane 55mph type roads with some in town cruising. (I'd say about an 80/20 split) I'm pretty impressed with mine at an average of 33mpg. It sounds like you have a really heavy foot, or something is wrong.
Oh, my car is an MT, bone stock, and using either 94 octane with 10% ethanol or 91 with no ethanol. Fuels with ethanol can reduce mileage a bit, but wouldn't explain 18.5mpg.
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