That gas is cheaper is "no reason" to use your car more time? People are likely to think more reasons to travel if is easier to travel, the barrier to entry is always an important deciding factor, e,g. if I visit my romantic partner once a week I may start visiting them a bit more if it gas prices don't raise much but my income does, also when looking for a new car more likely to buy a gas vehicle than an electric one, and companies may end up reaching similar conclusions, e.g. a a potential client that is too far away so gas prices are a significant factor can offer a better rate if gas prices drop or at least increase slower than their profits.
I don’t think the cost of fuel is the primary factor in travel decisions… it is almost always the cheapest option regardless. People are more interested in time and convenience, both of which become drastically less favorable the longer you have to drive.
If you search "survey would you travel more if gas was cheaper?" in google you get an AI summary saying "Yes, lower gas prices would likely lead to increased travel for many people. Surveys consistently show that the cost of gasoline is a significant factor in travel decisions, with many indicating they would travel more if gas were cheaper. "
Or what's your reasoning for the correlation to higher future air pollution?