hey, i was told that if i get a superchip in my truck, that i would have to use high-octane gas to provide high performance. i'm just using regular-octane gas now, but if i feel like trying out the high-octane gas for awhile and then going back to regular, will it hurt my truck at all??? help!
thanx
JP

 

You won't notice any gains by running a higher octane right now if your truck is stock.

The superchips amongst other things plays with your timing, thus you need to run higher octane to avoid pinging or detonation.

Hope this helps.

 

Switching between high and low octane gas will not hurt your truck unless it specifies that it requires higher octane than what you're you using. You shouldn't have any problems with a stock truck.

Bob

 

There have been posts here on F150 regarding running the higher octane when it is not needed. Those who know said running 93 in a stock 5.4L will cause excess deposit build up in the cylinders.... it apparently doesn't burn as cleanly as 87 in a stock motor.. do a search on the forums for octane.

John

 

87 octane and 93 octane automotive gasfrom the same oil co. have the same energy content/power. The 93 octane will resist preignition, can make use of advanced ignition timing, will burn slower than the 87 octane, and may reduce performance/mileage in a vehicle tuned for 87 octane.

Get a chip--they 'rock'!

Dan

 

I have a stock Expy 5.4, 4X4 been running 87 octane since I bought it used about 6 months ago. I have run 93 octane for the past 4 tanks as a mileage test and I get better gas mileage with the 93. I get about 11.8 with 87 and usually 12.5 to 12.8 with the 93. Those are city only #s, haven't taken a trip recently so I can't say what will happen on the highway. This increase has been consistent over the past 4 tanks so I don't think it is a fluke. The only way I think higher octane would increase mileage is if your internal timing retard senses pinging and is pulling ignition timing back to a point that it was hurting mileage in the first place. I am going to switch back to 87 or 89 and check it for another month or so to get a better understanding of how different octane affects my truck. I don't think higher octane will damage your engine but in most instances it isn't necessary. I'll be getting a Superchip soon and then I'll obviously run the required fuel all the time.

 

if it was just a coincidence but I was using premium (92 I believe) for a couple of months and I would notice small puffs of black smoke from the exhaust upon start up and when I pinned it (only for a second or so). I was concerned and read about the gas not burning correctly and leaving deposits in the engine so I switched back to 87 and haven't noticed a thing since. Mileage was a little better with the good stuff but perfromance was no different . . . or so little that it wasn't noticeable.

I'd stick with 87 . . . until I buy a Superchip of course