Nominal prices of gasoline are at post-WWII highs. Even in real terms, gasoline prices are high -- higher than the peaks of the early 1980s. Yet gasoline is actually more affordable than ever, according to Indur Goklany. In this post on The Commons Blog, Goklany notes that:

Relative to 1978, the price of regular gasoline has increased by 260 percent in nominal terms and 47 percent in real terms. However the price-to-income ratio has declined by 17 percent, i.e., it is more affordable today.