There are a few gas stations near the airport who do not post their prices. Their gas prices are more than $2 per gallon higher than other Orlando stations. The city is charging these stations a $1000 dollar per day fine because they do not have their prices posted but the stations still find it more profitable to pay the fines and not post their prices.
When you return your rental car, fill up before you get very close to the airport and avoid stations who do not post their prices!!!