How to properly conduct an experiment - Page 3 - Fuelly Forums

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Old 01-23-2015, 08:19 AM   #21
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Quote:
Originally Posted by WorkingOnWise View Post
Is topping off the gas tank, up to the top of the filler neck, really a good way to be sure there is the same quantity in the tank for every test?
Right off the bat, I and anybody can be 2% off due to that.

The only way is to use an external tank and then temperature has to be taken into account for volume increases/decreases.
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Old 01-23-2015, 09:27 AM   #22
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Yea every fuel pump is different, most overestimate how much you put in, some are slightly under. You can test this by filling a small Jerry can that you know the exact size of. 5 litres is pretty common, fill it up and I bet you a small sum of money the pump will read higher that what you've allegedly put in. Now empty it and try it again at a different station, it will be different again. Annoying but true...
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Old 01-27-2015, 09:57 AM   #23
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Even if the pumps were spot on, there are so many other factors affecting accuracy.

Having run a standards calibration lab, I have to chuckle at how some measurements are made by the general public.
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