Fumes or gas smell is a good indicator that something is amiss that needs attention.PS my garage (and I) never smelled like gasoline in any carb'd car I've owned, including the one in my sig pic. If a gassy smell is coming from a car, blame the person in charge of tuning it, not the technology, or lack of it.
New technology computers use all the sensors to mask a problem that should have been addressed way before it throws out an error code. That's one reason I never keep a newer car past its full warranty.
Just my opinion.