How to properly conduct an experiment

[theholycow]

Originally Posted by WorkingOnWise

The pump error I found was by filling to the point that the nozzle tripped off, noting the quantity of fuel, the topping off the tank, right to the top of the filler neck. I did this on several pumps and several cars a few years back, and saw some pretty wide variations. [...]

But, did you try it and find it inconsistent on the same car, same pump, same day? That's the accepted way to call it "accurate" around here, and I'd be interested to hear if that assumption has been experimented and proven wrong. It wouldn't be the first time for me.

Thanks for the info on tires. I'll be reading that next!

I finally made the canned post, so I'll have it ready for next time.