NASHVILLE — Motorists in Tennessee and across the country aren’t getting any relief from the rising gas prices. As of Sunday, gas prices averaged above $3 per gallon in 14 states, the majority of which are in the northeastern and western U.S. Rising crude costs, switchover to more-expensive-to-produce gasoline, tighter supplies and robust gasoline demand continue to help lift pump prices across the nation, AAA reported. Monday's national average of $2.93 is 6 cents more than a week ago and 58 cents more than this time last year, according to AAA.