Is it ok to fill up with gas when your tank is over half full?

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Gas does spoil, but I've seen cars run fine on pure gas that had sat for nearly two years

I wouldn't be worried - you keep topping it up with fresh petrol, and I wouldn't think you'll ever reach the point where the octane has dropped low enough to cause ignition trouble

>>17668005
Would it make a difference if it's a high octane car? I use shell premium because the car is a 6.4 L Challenger. I just worry about stuff like this because I plan on keeping the car a very long time.

As others have said, you should be fine. Maybe skip one Friday a month to get the tank down to 1/8 or less, then fill up. And/or add some sta-bil or similar if you want. I only drive my car 1-2 times a month in the summer, and I add fuel stabilizer before letting it sit, and have had no problems.

>>17668150
Not really

I've read numerous posts about people saying that high octane fuel actually lasts longer, as the detergents and boosters often found in them keep it in better health

My friend died that way