Even if the price of gas were much lower, you would still see a reduction in miles driven simply because 23 million unemployed or underemployed people have no reason to drive as far as those who have to commute to a full-time job.
No reason to drive as far as they did when employed and every reason to drive less since their incomes have likely been reduced drastically. Unemployment by itself does not nearly cover lost income, it’s usually half or less.
I know I once would drive into town just to look around, go into a Lowes or similar to check out the garden center, even drive out to the country to enjoy a nice day or to clear my head if I was worried about something. Don’t do that now, and I’m working.
The only two remaining instances of driving for pleasure in a year for me are an annual vacation beach trip and a fall drive up to the Blue Ridge Parkway. Everything else is coordinated around necessary travel, to and from the office. Family events are the only thing that gets me on the road on weekends anymore.