Any worthwhile fuel additives for a vehicle that is infrequently driven?

I haven't put gas in my Ford F150 since February because it sits most of the time. I'm wondering if there are any fuel additives I should keep in it while it's sitting.

If the vehicle is parked for long term, you should use a fuel stabilizer such as Sta-Bil to keep the gasoline from evaporating. Read the instructions on the side of the bottle. You might also want to disconnect the battery and put it on a "trickle" charger to keep it fully charged for when you DO want to drive it, and check the tire pressures occasionally.

Any worthwhile fuel additives for a vehicle that is infrequently driven?

I haven't put gas in my Ford F150 since February because it sits most of the time. I'm wondering if there are any fuel additives I should keep in it while it's sitting.

I have a 1999 Dodge Ram 2500 4x4 w/plow. It hasn't been used since February. Every time I go to start it, it starts right up. No nothing added to fuel. In fact, the gas in it was put in in 2009 as a full tank fill up. It is down to a 1/4 tank now. The longest it gets driven is when I take it in for inspection.

Just keep the vermin at bay and you should be good to go.

Gasoline can become stale and even gum up after a period of time. I would suggest using a fuel stabilizer to prolong the fuel's life.

Also pump up the tires to keep the tires from flat-spotting ( developing a flat spot from sitting in the same position for long periods of time ).

Years ago a can of gas could be used for a couple years w/o problems. Todays Ethaol gas has a shelf life of 60 days, then things start to happen. Ethanol is in all grades of gas throughout the country, and its "bad habits are: it likes to collect moisture. It will also eat older rubber gaskets, "O" rings and the like. Lucas has a bottle of "anti Ethanol Fuel treatment. It only takes a few ounces to treat a gas tank / gas cans so it goes quite far. I put it in chainsaws, lawnmowers, snowblowers, trucks, cars and anything that is stored for a while. Although Seafoam & Stabil are good products, they are not designed for long term storage of Ethanol. Lucas is. By the way, Marina gas is Ethanol Free. (boats are excempt from Ethanol)

Your in for a lots of things that are going to happen. Sta-Bil is one of the best things you can do, I'm not so sure it will keep the gas from evaporating but it will help the fuel for turning into shellac which is where you will have trouble. My neighbor had a F150 which sat for long periods of time and it started to run ruff on startup but would straighten out after warming, turned out to be a coating of shellac on the tips of the injectors. I cleaned them with a carb cleaner and it was fine. But it will happen again. The fuel filter is another thing you will need to change often.