I think that money and cost of the car has to play a part in it. People aren't just going to rush right out and buy a new car because gas prices are high. Many don't have money sitting around or can't qualify for a loan.
And the reason I drive the RAV.... Oh, boy, it's a long story.... I bought the car for my mother who is single and has rental properties far away from her home and no property manager. She needs the space to be able to haul around stuff to fix up her properties and her packed bags and air matress to live on for days or weeks. So she uses the space that compact cars and sedans don't offer. She's also a very large woman and disabled. The RAV was the easiest car for her to get in and out of. Actually, she couldn't even fit in a CRV. Then I was in an accident, my car was totaled, and I don't have the luxury of being able to afford a replacement. So here I am in it.
So, anyway, there's so many different reasons for why this country is in the situation it is in. The state of our transportation system is a mess... Thanks to American Dream and a house in the 'burbs, etc. And here we are. And it goes on and on and on until you're so wrapped up in this debate you can't find your way out.... Simply slapping a gas tax on or raising gas prices isn't going to solve the whole problem. As a matter of fact, it (alone, without addressing the other issues) has the potential to really widen the gap between the haves and have nots.... And don't even get me started on that.... I live in California....
ETA: All that said, I'm not opposed to a gas tax, and I'd pay it gladly if it meant it would go toward solving the other issues. But see my earlier comment about living in California.... We gave the state BILLIONS to solve our transportation issues. And they aren't solved and now we are about to lose services VITAL to our public (health care, education, etc). And our stinking Governor wants to blame it on us. To which I say, "Show me results! And I'll show you money!" Anyway.... I've ranted too long, and this thread is thoroughly hijacked...