383 gas smell

I have the same problem. On Saturday afternoon I might take my car out for a spin, pull it in the garage and shut it off then an hour later it smells like someone spilled a can of gas in the garage..... my wife hates it!! I don't know how true this is but I asked one of the old timers in the local car club and he told me it's the way they make gas today. Since most cars today use fuel injection they add chemicals to make gas atomize easier. In addition they add 10% ethanol and it just seems to vaporize while sitting in the carburetor bowl.