Bumper to Bumper Radio, the car guys on KTAR, 92.3 FM in Phoenix, AZ, broadcast every Saturday from 11:00 am to noon. On this show, Dave Riccio of Tri-City Transmission in Tempe, AZ and Matt Allen of Virginia Auto Service in Phoenix, AZ talk about the advantages of premium fuels and whether or not you should be treating your car differently now that gas prices have dropped. Also on this show:

• What are the effects of using unleaded gasoline if my car requires a higher grade of fuel?
• Why your car’s fuel injection type affects the health of your vehicle.
• How carbon build-up in your valves occurs over time.
• Do you see more energy put out from a lower octane engine?
• 1977 Volkswagen Convertible: Who would you recommend to work on my specific car?
• Acura Integra: My car is beginning to sputter while starting after recently getting some work done. Could this have to do with my fuel type?
• 1979 Mazda RX7: I’m looking for a shop who works well on rotary engines. Who would you recommend?
• 2005 Lexus ES330: My remote key functions fine, except that it doesn’t remote-beep while unlocking. Any idea what could be causing this or where to get this looked at?
• 1999 Ford F250: While driving around 45 mph I’ve began to notice some sputtering. I changed my coils and it seemed to help the problem, but not completely. What else could be contributing to this?
• 2013 Toyota Corolla S: While getting an oil change, the shop told me I needed a series of these other small repairs. Does this sound right?
• 2007 Dodge Grand Caravan: My car is dying just after refueling, but then doesn’t have any problem until refueling again. What could be causing this?

Cars talked about on this show are the 1977 Volkswagen Convertible, Acura Integra, 1979 Mazda RX7, 2005 Lexus ES330, 1999 Ford F250, 2013 Corolla S, 2007 Dodge Grand Caravan.