Quote:
Originally Posted by ProDarwin
The way I decide isn't very technical in nature. I just think about the last tank (usually the last few days - week) and where I went. I consider MOST driving around here about 50% city (average speed ~25mph, lots of stoplights, speed limits around 35mph), highway out to my parents or any time I am touching interstate.
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Every time I fill up, I take my trip timer value, multiply it by 30 MPH, and then divide that into my corrected trip odometer value (corrected because my speedo pinion factor isn't
quite dead-on accurate - about 99.3%).
For the resulting quotient, if it's below 1, then that tankful is completely city driving. If the resulting quotient is above 2, then that tankful is completely highway driving. Values between 1 and 2 are treated as follows: subtract 1, then multiply by 100. That gives me a percentage of highway driving. I cna then easily convert this value into something I can plug into Fuelly.
It may not be completely accurate, but it gives me a good idea.