I've never seen a trip odometer that didn't have tenths of a mile.
Only because averages don't impact the effect of limited accuracy, averaging mitigates the effect of limited precision. But both precision and accuracy impact the error in any one reading.
I think you are missing something. What you replied do does not in any way indicate a limited understanding of precision and accuracy. But affect each measurement taken. An inspection measurement will require the combination of accuracy and precision in that measurement be within some limit. What do you expect them to do, take dozens of measurements? There are economic considerations, especially since this is about economics anyway. It is to prevent excess profits from being made by shortchanging the customers.
Not sure what that means. What I am doing by repeatedly topping off is to reach the point where the fuel in the filler neck is right at the nozzle so it won't run anymore, but rather cuts off immediately. This results in a very consistent fill level.
I think my consistent mileage measurements support my conclusions.
You seem to be doubting my results. Are you suggesting I am fudging my data?
You seem obsessed with evaluating the resulting MPG measurement even though you can't put numbers on the accuracy of the parameters that impact the MPG errors. If you can't come up with numbers, your ideas are of no value. But that doesn't mean the errors in my MPG measurements aren't as they appear to be.
Actually, I do have numbers for the parameters. I know the mileage to a fraction of a mile (even though a tenth mile out of 400 is far more accurate than anything else involved) and I have no reason to doubt the pump giving me 20.0 gal when it says 20.0 gal. I don't fill up at the same pump each time so if some were off it would show up and I'd be able to identify which pumps were inaccurate.
You keep saying this without indicating what you mean.
Lol! You see, I understand you because you're the type of person I had in mind when I made that comment.
Have done, 0.1 mile over 100 miles has been calibrated... actually, it was much better than 0.1 mile since I can interpolate the analog dial. I don't drive that stretch of road anymore, so I can't calibrate 100.0 miles continuously anymore or I would.
Sorry, your sentence doesn't make sense to me. Can you construct it properly?
If what you say is true, why is it I have only seen 21 mpg a very, very few times in the 20 years I have been checking my mileage? If what you are saying is true, I should see a much wider variation in measurements than I see. As I have said, 95% of the time I get between 19.5 and 20.5 mpg or within a 4% range (+-2%). It's actually even tighter than that. It's more like 19.7 to 20.2 mpg but I can't say just how often.