Where I'm from, flyover country, poor people are much more likely to drive 15-20 year old clunkers (dodge durango's, jeep cherokee's, and other big heavy vehicles seem to be super popular with the poor here), they also tend to have longer commutes due to fewer job opportunities and less mobility when it comes to housing.
We're not even talking about the indirect costs. When the price of fuel goes up everything is affected. People like me will easily absorb those costs while the people living paycheck to paycheck will suffer. I drive a 7 year old Honda Civic, and I'm lucky enough that I telework. The mechanic who changes my oil, the AC repair guy who spends a large part of his income on fuel for service calls, and the people who work in the restaurants where I eat and the stores where I shop will probably be forced to give something up.