Here are some more invalid numbers I found for them:
(352) 753-7963 (out of service number)
(352) 391-9699 (a working number but the resident's answering machine greeting says he's not the Shell station!!!)
(352) 750-2885 (fax machine)
Sounds like the best thing to do would be to stop by there during the day in person to ask. Finding a legit phone number doesn't seem to be getting anywhere!
Bill