Johnson estimates that food and energy eat up about 15 percent of consumer spending at today's prices, compared with about 12.7 percent two years ago.
Of course, at lower income levels, these percentages are much higher. One sign of the stress some consumers are already feeling is that some AAA offices have already seen an increase in out-of-gas service calls, as motorists try to put off filling their tanks or drive around trying to seek out the gas station with the least expensive price.
Also some regions are being hit harder than others. Gas prices in Hawaii continue to set new highs, according to AAA data. The average price on Wednesday was $4.51, topping the prior record of $4.50 for a gallon of regular unleaded set in July 2008.