My fuel gauge doesn't work so I fill up when the trip odometer reaches 200 miles!
We fill up when we go to Costco - which is every 15 days or so. So depending on driving in those 2 weeks we might be coasting in on fumes or we might still have 1/4 tank.
Filling more frequently is like dollar cost averaging same as investing. In the long run it will $ave dollar$.
Filling when it is cooler outside is false. http://newfrugality.com/top-5-gas-saving-myths/
Allowing your reserves to get too low can be VERY COSTLY. The fuel pump is in the gas tank. The fuel pump is COOLED by the gas in the tank. The fuel pump CAN overheat and fail causing HUNDRED$ of DOLLAR$ in replacement cost.
DFIL always waited for his digital display to show 50 miles to empty. Cost him $600.00 for a new fuel pump!
The fuel pick-up is raised to prevent sludge from entering the pump and even if it did, the filter will stop it.
I fill when the tank is 3/4 full.
Our mechanic told us if youmalways run it to empty the sludge doesn't build up.....IF younnever let it get empty and then start doing it can be a problem. He also told us never to buy gas at Sam's or BJ's - something about leftover dregs at the bottom of an assortment of delivery trucks.
I don't know - we've always run our car to empty and have never replaced a fuel pump.
To me - half a tank means empty. I always fill at half. You never know when you will be stuck in some serious traffic.
I wonder if "city" people fill up more often than those who have less traffic near their homes.