fkess

I paid $3.31/gallon of 91 0ctane today! Is there a knock sensor like there is in my '91 100 that will allow me to run lower octane (87) w/o damaging the engine of my 2004 3.0L cvt C5/

April

if you have a heavy foot at all or run the car under high load, an AW member found that their car actually used more fuel.

Cargasm2.7

less dining out, will all save you much more.

Preservation (Axel)

I'm OK with everything but the beer, can't work on the car without beer !!!

A6sport

I'm with Cargasm...not worth it, pinch pennies some where else!

Press

I also agree........less on BS more for the car...8^)

baskinblack4.2L

The car will not run well under strong load and this will give less timing and less power.

Also remember low oct gas burns faster and with less force. This can mean you will use more fuel to obtain the amount of needed power to accelerate the car.

michaelgvh

Mid-octane is purchased MUCH less frequently at any gas station. Most people either buy super or regular. So, the mid-grade sits in the tank longer on average and is less 'fresh' since it is empied less often by the customers.
Also, mid-octane is apparently a mix of super and regular in the first place. It's not its own gas, they just mix the other two so you are never 100% sure of the mix and if the gas station is a little sleazy and trying to squeeze a few extra pennies out of the mix.

This may all be paranoid BS. I am simply repeating what I heard from other car forums. (Fora? is it Greek?)