Neil,
Gasoline use has actually been about flat from last year. Here is the last report for the month ending March 7. This is from the weekly government report on
oil and gasoline inventory and prices.
"Demand for gasoline over the four weeks ended March 7 was 0.4 percent higher than a year earlier, averaging nearly 9.1 million barrels a day."
So even at these high prices gasoline use in the US is slightly higher than a year earlier. I have been watching this for quite some time and have been surprised that the use hasn't gone down.