TSB: HYBRID FUEL EFFICIENCY TIPS AND TROUBLESHOOTING PROCEDURE - THE OPTIMA HYBRID (TF HEV) OFFERS CUSTOMERS THE POTENTIAL OF EXCELLENT FUEL ECONOMY. HOWEVER, BECAUSE SOME CUSTOMERS MAY NOT BE ACHIEVING THE PUBLISHED EPA-RATED CITY/HIGHWAY NUMBERS, THEY MAY BRING A VEHICLE TO A DEALERSHIPÂ’S SERVICE DEPARTMENT. THE FOLLOWING INFORMATION IS PROVIDED SO THAT THE SERVICE DEPARTMENT WILL BE WELL INFORMED TO ANSWER THE CUSTOMERÂ’S CONCERN AND, IF NECESSARY, TO TROUBLESHOOT THE VEHICLE.