Quote:
Originally Posted by humfrz
HEY! ....... some of you gang members ........ 
A couple of good ways to fool yourself in measuring gas mileage is to measure from when the low fuel light comes on OR to believe in the mileage indicator in your car.
So, I suggest that you drag out your paper and pencil, fill up the tank till the pump clicks off ....... drive the car some distance ...... come back to the same pump (if possible - not necessary) and fill up till the pump clicks off.
Now you have two numbers ....... miles driven and fuel consumed.
Here is where the paper and pencil come in .........
So, talk to us about l/100 kilometers or miles per gallon.
(I'm just typing in for @ Tcoat, while he is on holiday and @ Ultramaroon while he is at work)........ 
humfrz
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Knew you would have my back!
I am not sure what has started this Miles Per Light fad but it is a horribly inaccurate way to measure milage. If the light comes on at 270 miles on one car and 310 on another it just means the Spenser float I'd a bit different not that the milage is worse. The difference of 40 miles equals something around a gallon and a half of fuel. That gallon and a half spread across the tank is probably under an inch or so. No idea how strict the float spec is but doubt the variation is unreasonable.
Th milage indicator may be off a couple of MPG but it is close enough if used to just measure against it's self and massively more accurate than MPL.