Gas pump accuracy.
 

Good reason to use the same station every fill. This is interesting although it's in Seattle I'm sure it common every where. Need to do a search and find the pumps that pump to much in your city.:D .

https://seattlepi.nwsource.com/local/...aspumps27.html

Pump slow?

"That's right. From 2002 through 2005, the city's inspection results showed that pumps were more than twice as likely to give consumers more gas than was paid for if the consumer pumped slowly. If the gas was pumped fast, consumers could still get extra fuel but also had a slightly higher chance they would be shortchanged."

I do know that the vapor recovery pumps I've seen can put LESS gas in your tank than the regular type.

These pumps have the rubber collar...but also constantly are sampling the air at the nozzle...when the get a whiff of vapor...they shut off...and suck it back in.

At least this is my theory as to what's going on. Helps if you leave an inch or so between the collar and the fill pipe.

I guess pump slow it the name of the game - and I already ran into the suck the gas back up the hose trick almost lost a half gallon on a fillup.

oh honda-tech I got flamed when I did they acetone testing on the same pump. They claimed that the gas pumps dont shut off at the same level every time...

what I do now, is top off every tank, it takes a little longer, and its tedious, but when you see gasoline where your filler cap should be, you know your pretty close to being full....

I just worry about venting & expansion...er...venting anyway. If I top off, then drive my car home to (inevitably) park in the direct sun....I worry about that. Super full tank...hot sun...all that damn pressure building up. I dunno. I don't mint topping off at all...IF and ONLY IF I'm immediately heading out to burn at least 1/2 gallon.

Good idea to drive right away and lower the tank some - I usually gas up before a trip and usually when I am out of town anyway so it is not a problem. I think there still may be a air pocket on the top of the tank even when it is full but I am not absolutely sure. You WOULD think there would be a better way to gas up a car by now however - I still think a catch can on the filler area is a great idea - on motorcycles they have a spill area around the filler and a drain hose to the ground under the bike.

Definitely noticed that Exxon rips me off every single time.
I am to the point where I completely hate them and will never buy gas there again.
My car will usually take 8 gallons at the pump, if i go to shell etc....
And that's almost dead empty.
At the local Exxons, i end up pumping 9.5 - 11 gallons.


Is there any way a person can check to see if a gas station has passed pump inspection?

There should be a "weights and measures" sticker on each pump and the inspection date with the name of the inspector - maybe you should report them to the inspector to get them checked.

Definitely going to look for that next time
thanks for the info