I was told I can reprogram my computer for econemy and I can use the 87 octane. Has anyone else herd of this and if so done it?

 

No never heard of it. I do know that the PCM will "learn" over time from the type gas and driving style, but as a true reprogramming, I don't know of that. Maybe someone else can give more info

 

I think that it can run on 87 already if I'm not mistaken. It shouldn't hurt anything. Never heard of what you're talking abou though.

With 87, you'll get worse fuel economy, but it'll be cheaper.

 

Man oh Man,

Don't any of you guys read your owners manual? That should be the first thing you do on any vehicle you purchase.

The owners manual of the 2004 Dodge Ram powered by the 5.7 HEMI clearly states that 87 octane is perfectly acceptable to run however, 89 is preferred. No damage will occur with 87 octane.

The same goes for the 2006 HEMI with MDS. That's all I've ever run in both mine, [:-]no problems whatsoever. If I'm towing or feel like a little extra pep I'll run 89 but at these prices I'm sticking to 87 octane.

And you'll get the same gas mileage regardless of what octane you use. Don't take my word for it, try a tank of both and do the math. And don't go by what that overhead computer tells you. That thing isn't worth a hill a beans.

Fill your tank with 87 octane and zero the odometer. Next time you fill up divide the current mileage by the number of gallons it took to fill the tank. That's your mpg. Do it again with 89 octane and tell me there's a difference.

I can only tell a difference between 87 and 89 on a humid day. I can't tell any difference between 89 and higher.

Save yourself some money, burn 87!

H.H.

 

I get better gas mileage and better power by running 89. The only way I get any better with 87 is if I use the Superchip programmer and program it to run 87 octane.