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was broken in after all, knocking was lowering the

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buickanddeere

08-13-2006 17:36:09

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As per my post a few days ago.I was all happy with the improved mileage my 6.0L 4x4 crew cab GMC had after a heavy hauling trip. Turns out the 1st tank of 87 octane dropped the mileage back down to "normal". While towing in hot weather I had been running her on 91 octane. So that last 91 tank fill at the pumps and a 91 tank fill from my Jerry Cans at home. Had me thinking the soot was cleaned out of her and had everything beded in and seated. Next fills will have to be 89 & 91 octane and keep some notes on what's going on. There must be enough compression pressure in that engine. She's sensing knock and retarding the timing when running on 87 octane? It might be one of those vehicles that's cheaper per mile to run on premium rather than tractor octane.

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IH2444

08-14-2006 07:24:47

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Re: was broken in after all, knocking was lowering in reply to buickanddeere, 08-13-2006 17:36:09

I run 93 in MY 90 Subaru. I get at least 80 miles more per tankful with the 93 octane which more than makes up for the cost difference.
And the increase in performance with the little 1.8 engine is noticeable.
I am not convinced that the octane ratings are accurate any more, especially on the lower octane products.
I bought 93 octane at one station and the engine would rattle and the mileage was poor. Last gas I buy at that station.

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Mike M

08-14-2006 06:42:05

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Re: was broken in after all, knocking was lowering in reply to buickanddeere, 08-13-2006 17:36:09

Lets see some mileage figures ?

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T_Bone

08-14-2006 02:39:03

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Re: was broken in after all, knocking was lowering in reply to buickanddeere, 08-13-2006 17:36:09

Hi B & D,

My wife put 93 in our 4cyl by mistake and I noitced our mileage had climbed up from 35mpg to 39.5mpg.

Even with the mpg increase it was a wash on the money exchange at $.10gal at $1.5gal but now it would save about $1.12 per tank.

Couldn't tell if there was a preformance increase.

T_Bone

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the tractor vet

08-13-2006 19:08:52

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Re: was broken in after all, knocking was lowering in reply to buickanddeere, 08-13-2006 17:36:09

Well i ran a 88 Ford 460 for 287000 miles about half of that was pullen my 28 foot goose neck haulen tractors and equipment and it ran the 93 octain in her and even with a load of tractors on sometime there was two to four tractors on a load depending on size and it would do around 8-10 MPG and just running the the truck by it's self BTW it was a F 350 4X4 dually on a run to one of the sales it would do a shade over 14 . Three years ago we bought a 03 Dodge Durango with the 360 in it and the first tank of gas that went into it was the 93 and it did over 18 going out to the Talers gathering at Slo's when we took it in for service i was talken to the service manager and he came unglued onme for running the 93 so we dropped back to the 87 and OH wait guess what it went down to 14-15 MPG why???? because 87 burns fast and hot 93 burns cooler and longer . That is why we run the 93 octain in the tractors as they run cooler less chance of melting a piston and less fuel used and besides that is what a 6 Cylinder gasser I H is suppose to run bare minium .

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Hal/WA

08-13-2006 18:15:55

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Re: was broken in after all, knocking was lowering in reply to buickanddeere, 08-13-2006 17:36:09

You may be right. And I think your analysis of why the mileage improved is probably correct. When gas cost 30 cents per gallon and premium cost 40, the difference to run premium was a huge percentage. But with regular over $3 and premium 20 cents more per gallon, the percentage is minimal. It wouldn't take much of a mileage increase for you to come out better with premium.

I have heard of other rigs that would run OK on regular, but ran better on premium. In the winter, we have winter formula gas (whatever that means) in my area. My old Ford pickup will run on the winter gas, but will not pull worth a darn--it pings badly under load. If I have heavy work to do with the pickup, I buy premium rather than messing with the timing. It works fine for anything on regular using summer formula gas.

These are interesting times....good luck!

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Mike (WA)

08-14-2006 08:38:05

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Re: was broken in after all, knocking was lowering in reply to Hal/WA, 08-13-2006 18:15:55

Interesting stuff, about the improved performance with premium. I've been running my old Lincoln on either midgrade or regular (alternating), but have noticed a drop-off in performance- think I'll go back to premium, and see how it does. Your right about the reduced cost differential- hardly anything at these prices, and any improvement would be worth the slight extra cost.

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buickanddeere

08-13-2006 21:16:10

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Re: was broken in after all, knocking was lowering in reply to Hal/WA, 08-13-2006 18:15:55

As for cooler? Well burning 87 octane and 93 octane in a open burner etc. There is virtually no difference in the btu's or the flame temp. Now inside an engine is an altogether different kettle of fish. If detonation/knocking/pinging is occuring. Then yes along with the pressure spikes of 2,3 even 4 times higher than normal combustion pressure. Combustion chamber temps are also increased along the shock wave front. So yes in a round about way. A engine knocking on 87 octane does see higher temps then the same engine not knocking on a higher octane fuel. No if the engine doesn't knock on 87 octane. Then the combustion temps will be identical running on 97 or 94 octane fuel. Tonight with an air temp of 60F rather than 90F of a few days ago. The mileage was improved a wee bit. I think I'll install a bypass pipe at the throttle body so engine coolant isn't heating the assembly to 195F.

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