As U.S. national average gasoline price reached a four-year high amid global tensions, California -- where prices are the highest in the nation -- saw its average gas price surpass 6 U.S. dollars per gallon on Thursday.

As U.S. national average gasoline price reached a four-year high amid global tensions, California -- where prices are the highest in the nation -- saw its average gas price surpass 6 U.S. dollars per gallon on Thursday.

Go to News Site