There is a difference between ignorance (not knowing) and incompetence (knowing and not using the knowledge).
As far as the mileage computer, do your own experiments. Even dividing you trip miles by the number of gallons can be off by 1 mpg either direction because it's difficult to gauge how much you've put in a tank exactly. If you find a 1-2 mpg difference, then I'd call that insignificant. If it's more than that, then you'll have to figure out which one is more reliable. Typically, it's the old fashioned method. This applies to all vehicles- including the mighty Prius. I recently had a friend with a new Prius figure his mileage by using the old method, and he came up with only 36 mpg. We're still waiting on several tanks to average it out- that's my excuse to calm him down even though I know it's only going to average around 36.
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