The 42-year-old looked all man with his facial hair and short cropped hair as he filled up his car.
Chaz, the transgender son of singer Cher and her late husband Sonny Bono, was born female, but has spent the past few years slowly becoming male.
While growing up, he says he always felt uncomfortable and, after years of feeling out of place, he realised he was not Chastity, but Chaz.
A forthcoming documentary entitled Becoming Chaz follows his transition and has been nominated for three Primetime Emmy awards.
Chaz has also released a book, Transition: The Story of How I Became a Man, released in May, chronicling his journey from female to male.
He currently lives in California with his girlfriend Jenny in a six-year relationship which transformed, along with him, from a lesbian relationship to a heterosexual one.