People are paying nearly ten cents more for a gallon of gas than they were two weeks ago. 

The Lundberg Survey says the jump has been spurred by worries about Ukraine and the cost of ethanol. 

The average price for a gallon of self-serve, regular unleaded is about three-dollars-51 cents nationally. That's about a 21-cent increase over the last four weeks. 

The good news is motorists are paying about 23 cents less for a gallon of gas than they were a year ago when the average price was three-dollars-and-74 cents.  

The lowest average price for a gallon of unleaded is three-dollars-18 cents in Jackson, Mississippi and the highest price is three-94 in Los Angeles.