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It may be hard for some to understand, but there are those of us that just plain like numbers, and don't mind keeping accurate records. This doesn't mean I worry about my mileage, but as KZ said, use it to monitor overall drivetrain condition.(which seems to be improving, even though the belt has 6k miles on it, and the original spark plug has more than 6.7k) So far my average this year is up 2.9 mpg over last years 84.9.....no tuning or replacement parts needed at this time.
Maybe in my case, it's just that old habits are hard to break. There was a time when I would pump more than 15000 gallons of fuel a year, into my truck. An increase of just .2 of a mile per gallon, would be a savings of $1100 to $1500 by years end. At today's price, the savings would be at least 50% more than that. Those savings over years and years, helped me to be able to retire at 62.
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