a little less than three-quarters of a tank. 13 gallons, $70. we found most people didn t even see the price until we told them. $4.14. reporter: no. try again. $5.39 here. i think we ll be going somewhere else. reporter: $5.39 a gallon. you still going to fill up here? no. reporter: you re leaving? yeah. reporter: turns out at sun coast, none of the prices are posted out front. do you want to make sure you ve seen the price? well, it s lower than california, i know that. well, what the i guess not. reporter: across the street, the nation s second-most expensive gas station, prices also not posted. stations like this prey on unwitting travelers hoping to fill up their rental cars on the way to the airport. so, we tried to ask station owners here about their prices. put down his cell phone number. that would be helpful. i can t give out the cell phone. reporter: we e-mailed and called. no response. this is technically not price gouging, a legal term which