[66Notchback]

Would running a higher octane fuel lend itself to better fuel economy?

I've always run "mid grade" gasoline in my truck, and given the cost I'm considering switching to "low grade" or "regular".

[Road_Runner]

I have always put regular fuel in all of my cars. My cousins are mechanics, and they have always told me that regular fuel is good enough especially in new cars.

[MaximumSpeed]

We use the lowest grade and it does fine. Actually, one of my vehicles works with the E-85, which is usually about fifteen cents cheaper than standard unleaded.

[MyMotor]

One thing that the more expensive fuels have is additives that help keep your injectors clean. City driving with supermarket fuel can cause more build up.

[Dodge Doll]

Originally Posted by MyMotor

One thing that the more expensive fuels have is additives that help keep your injectors clean. City driving with supermarket fuel can cause more build up.

No kidding, 'cheap' gas runs differently, and I bet it fouls injectors and what-have, it makes my car stumble and 'fart': I don't buy gas from those *ahem* sources as a result.

[Eugene]

I think the octane issue may have been applicable with older models. I asked my mechanic about this, and he said to go with what the manual recommends because that's how the car has been designed.

[Wayne]

When I have been driving in the mountains at high altitude, I find that a half and half mix of the recommended grade with high octane gas gets the best performance.