Premium Fuel?
I'm a chemical engineer in a refinery. Here's what I know.
Many brand name premium gasolines will have superior additive packages to regular gasoline. This may include anti-gum additives.
Save yourself some money. If your gasoline will be in your tank longer than a month, use a product like "Stabil." It's available at Wal Mart.
I have an F250 that I rarely use because of it's mileage. I use Stabil.