[BoxcarBill]

The auto shut off in the pump handle always shuts off at at LEAST 1 gallon short of what will fit. Is it not advised to add the extra gallon?

 

[BluV3R18]

does it do it with every pump you pump gas?

one of the reasons is not advised to add extra after the pump clicks, is spilling gas on the ground

 

[08versailles]

LOL yesterday i filled er up, put in several liters after first click. I do it all the time, but usually i immediately have a good drive to bring the level down. But I don't super fill it and let it sit so full during summer.

 

[MuzzleNChains]

Even when I'm so low on gas it feels like it's going to cut off, the pump stops at around 11.5 gallons. Supposed to be 13 gallon tank.

 

[beemer.aric]

Isn't part of the reason it does that is because it can affect fuel economy when you add extra gasoline?

 

[Gorp]

Topping off can put liquid fuel into the vapor recovery system causing malfunction. Not worth the extra 20 miles you may get between fillups.

 

[Sularus]

I do the same method every time I fill up, no matter what pump I am at or what station I am at, it will render the same results. Good for figuring consistent fuel economy readings. What I do is pull the handle up enough to where there is a .10 gallon of gas flowing for every second. Once the handle clicks and stops I let it sit for about 30 seconds. After this, I will pull the handle up and let .10 gallon of gas flow for every 2 seconds. Once the pump clicks off the second time I stop and put the cap back on. This has yielded very consistent results in computing my fuel economy. I have done this since I returned home from my deployment to my new car. I have put 10 tanks in and I have not had any problems with fuel in the EVAP system, and I have very consistent results with my fuel economy.

To time it, I count out in my head "one-one thousand one, one-one thousand two" and so on for at least a count of 10 to ensure I have an accurate flow rate with the handle.