Why is gas 20 cents higher at the Davenport location then the Lakeland location? I live here and work there, I buy my gas there because it's so much cheaper

Local competition may play a part. Their store east 75 on 54 is sometimes 15 cent lower then their store west of 75 on 54.

Its close to i4 gas cost more near interstate

It's called "supply &demand"..close to interstate so more demand

Probably taxes

Probably local tax

Franchise just like McDonald's prices and merchandise can vary.