Does anyone put the good stuff..the 93 octane in their magnum? ? does this improve performance? how about gas mileage? just curious. The book says 89 but the dealer keeps telling me 93.

 

I have been debating this with many people, and I am using the highest octane gas for now because it doesn't hurt the car and I don't want to take any risks until I recieve a clear answer.

On one hand, the manufacturer says that 89 is good - the engine is set to burn 89. The computer would need to be retuned to use any different gas.

On the other hand, the manufacturer sells cars that meet whatever customers will put up with (aka marketing). There doesn't seem to be any allowance for my -20 weather (no need for the block heater yet in the RT, it starts up so easily) nor does 89 octane answer whether there is benefit in "higher" grade gas additives.

The main thing as I see it: does "higher" gas help compensate for severe duty service. I have not seen any benefit in mileage, however. I routinely see 15mpg in the city (town).

~ lower the car? The snow is already deep enough for me to have problems. bigger rims? I can't afford snow tires for the 18 inch rims. any other mods? Its too cold out, the traction control light is on permanently in the middle of Canada

 

This is a very debateable question. The car's computer has set the timing to run the engine properly on 89 octane. However, I have heard that the additives to increase the octane of gas are better for any engine. As of now, I run the recommended octane.

 

I am running 87. The book recommends 89 but allows 87. I throw in 89 once in a while.

On a recent trip from Phoenix to Las Vegas, I used 89 going. 20.4 MPG. Using 87 on return trip got 22.3 MPG. I'll stick with the 87.

Joe B

 

Joeb1 - hey are you driving an RT? I dont remember it saying 87 was ok for the RT. Just curious. If it took 87 that would be great. It is a 15 cents price difference up here in new england in some places.

 

RT owners, stick with the 89 octane. Using 93 octane is wasting your money, car won't run faster. It may run slower, as 93 octane is formulated to burn slower - to reduce engine ping or knock.

What say DodgeMech?

Bob

 

I have always been in the habit of gassing up the car when I get to half a tank.....
just a thing with me. I do mostly run 89, but 2nd to 3rd "top off, I will use 87.
I have not had any "pings or knocks" and I have not seen any mileage changes
from when a ran a couple tanks of 93.

Rex

 

Yes, I.m running an RT.

I asked a few mechanics at a dealer. They agreed that 87 is fine if it doesn't ping. Every third or fourth fill-up I throw in some 89. Runs great.

Joe B

 

You only have to run enough octane to keep the engine out of preignition. The car will actually make less power with the higher octane as Bob has alluded to. Higher octane fuel burns slower reducing the "bang". Some cars will run better when recommended by the factory because the programming has been put in to require more octane (more timing). If you run the lesser octane fuel than the PCM will have pull timing out to keep it out of ping and thereby reduce power. If the factory didn't program the car to run the higher octane fuel than there is no benefit to it.