I sometimes wonder how long it would take insects to evolve an instinct to avoid places that smell of gasoline (if many of those who don't detect it get squashe

I sometimes wonder how long it would take insects to evolve an instinct to avoid places that smell of gasoline (if many of those who don't detect it get squashed on a windshield). Of course I'm not denying the decrease in insect populations, which has been observed independently in many ways.