GP said EU levels, so it's not a few cents or "even" a half dollar. It's straight up doubling or tripling gas prices. This would no doubt impose a lot of hardship on people, and there might well be significant political upheaval in the process, but if you think it wouldn't change behavior and the suburban sprawl problem then you don't realize how inelastic people's income really is.
I think you mean "how inelastic the demand for gas is in the face of higher prices".
Of course people's income is fixed in this equation. Though I suppose you might try to earn more if gas prices go up.
What you're trying to say is that demand for gasoline is inelastic in the face of higher prices.
And here's a bit on gasoline...