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 which octane gas is right for your car and what the difference is. Special guest is Curt Rock from Curt’s Auto Repair. Also on this show:

• Is it okay to use cheaper gas?
• What’s the difference between octane levels?
• Which fuel burns faster?
• The manufacturer of my vehicle recommends that I use a high octane fuel but it’s more expensive. Will my car run properly if I use a cheaper fuel?
• Why is my fuel efficiency worse when I use flex fuel?
• 1991 Cadillac Seville: When I put the car in reverse and hit the brake, I’m hearing a click sound as though it’s locking up. Do you know what the problem could be?
• What are the consequences if I put the wrong fuel in my car?
• 2014 Dodge Durango: Occasionally when I start the car I see a puff of white smoke and I’m wondering if I have a fuel issue?
• 2002 BMW 525: The car calls for 89 Octane but I use 87 and I’m not getting detonation with that octane. Is detonation able to happen where I may not notice but it causing damage or wear to the car?
• 1998 Nissan Pathfinder: I have a knock sensor code coming up on my vehicle and after a few different kinds of repairs, it’s still showing. I’m not sure why it’s still appearing.
• 1988 Grand Wagoneer: I was told that the 91 octane doesn’t use ethanol and that it changes the boiling point of fuel and I was curious if there was any truth to that?
• 2006 Lincoln: Lincoln always requires or recommends premium gas and I’m wondering if I used a cheaper gas would that void warranties if something goes wrong?
• Can I get away with using lowing octane while I’m driving at higher altitudes?
• For towing is it better to use a premium or additive?
• What is the difference between gas stations and their pricing?
• 2001 Dodge Dakota V8: Are there things I can do to improve the gas mileage and fuel efficiency?

Cars talked about on this show are 1991 Cadillac Seville, 2014 Dodge Durango, 2002 BMW 525, 1998 Nissan Pathfinder, 1988 Grand Wagoneer, 2006 Lincoln, and the 2001 Dodge Dakota V8.