Hwy versus city driving is really subjective unless you keep extraordinarily accurate records of some sort (I don't) - and really of limited value. What might be more useful and objective is to replace that % value with the car's reported Avg Speed. Most cars can report this these days - and it seems likely this would actually give a clearer picture of mileage along a spectrum of city/hwy driving combinations than the gross % estimate. Thoughts?
ekobres 
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