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Old 10-18-2010, 11:27 AM
nanney1 nanney1 is offline
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O.K. second fill-up. Overhead computer reads 16.2 mpg. Hand calculation says 15.25 mpg. So, a little better than the first tank. The main difference is that I drove with O/D off on my short trips and non-highway.

On the other hand, it dawned on me that I was basing my hand caculations off of the odomoter readings from the overhead computer and not the odomoter on the dash, which doesn't have a trip set.

Just because I'm OCD about things, on this fill up, I'll compare the dash odomoter number to the overhead to see how close they are. Could cause a difference in the hand calculations again. It's kind of a pain since I'll need to actually write down and subtract the start/end numbers since I don't have a trip on the dash. Hopefully, it will be the same or very close to the overhead reading.
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