Fuel Saving Tips
Do not do this! It is hazardous at the pump, but there is a fuel vapor purge valve. Most used to be mechanical, but today they are all electrical. Topping off your tank forces the gas inside and will eventually corrode the sensor entirely, turning the check engine light on. Also, they are a pain to change and many made into the fuel pump assembly today which are $300-$400. Trust me I used to manage a parts store and I saw this all the time. It's best to stop when the pump does. There's a tiny chance you'all get close to 1/8 tank. Vehicles today simply aren't designed that way.
posted by Cartwright918 on August 7, 2017
this tip works for 56% of voting Fuelly members.