There's always 4 or 5 cars in my 30 x 40 shop - including '68 & '69 Road Runners, and several fuel jugs, some empty & some full - no aroma unless I open a jug to gas one up.
If I light one off just outside the shop but the tailpipes are almost in the shop, I can smell some exhaust, but no gasoline.
Only time I've ever smelled fuel in there was from an open jug, or a spill, from working on one of them.