Okay, did I imagine this old Pepsi advert, probably from the '80s?
A big limo pulls over to the side of a freeway, with steam pouring out from under the bonnet. A woman gets out, walks up to the hood, and opens it - under the hood are two recumbent cyclists looking exhausted. SHe hands them cans of Pepsi.
I've googled etc but can't find any trace of it - if I didn't imagine it, I want to rip it off