Sales of Chrysler, Dodge, and Jeep vehciles are down a scary 36 percent year over year, which means even the somewhat interesting marketing gimmick of the $2.99 gas guarantee isn't working very well. Unfortunately, gas for just under $3 is all Chrysler, LLC had up its sleeve this summer, as the Pentastar has extended the deal through July 31. We'd reported earlier that only 5-10 percent of all Chrysler product buyers were opting for the seemingly attractive promotion, which leads us to believe that the deal isn't much of a deal after all. Maybe Chrysler can borrow the tried and true "Do you have a job? Do you have $199?" from Kia, because the Korean automaker's sales are up 21%.