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Old 08-14-2003, 04:26 PM   #1
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Fuel Grade

I was reading some posts earlier talking about fuel grade. I have been running regular in my mh. Seems to work fine. NO knocks or pings. Got me thinking about whether the extra expense of mid grade might help boost power when travelling through the mountains. Does anyone have a comment on this.

Jai
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Old 08-14-2003, 04:54 PM   #2
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Pull my '54 22 footer with a F150 5L 3.55. When I pull with regular gas in tank may get a little ping on an uphill pull. Put in midgrade and made a very noticeable difference in pulling up hills. Just got back from trip in Rockies where I experimented with premium and could not notice any difference compared with midgrade. For me, using midgrade was definitely a positive for power increase and no knocking or pinging.
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Old 08-14-2003, 06:45 PM   #3
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i switched to mid grade i dont get as much valve ping and it seems to pull the hills better. lol
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Old 08-14-2003, 06:57 PM   #4
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454 has under 8:1 compression. Should do ok on Regular. I run my 454 burb on it and not had any problems. My burb is FI with a knock sensor so that helps. I have not noticed a difference in performance between the two. Just for a laugh I need to tank up tomorrow and I'll run mid and pay close attention to how it performs.
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Old 08-15-2003, 09:38 AM   #5
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toaster that wont be a good test for a 454 set up with no knock sensors. you probably wont notice any difference.. lol
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Old 08-16-2003, 09:48 AM   #6
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I started out using reg. gas my first season with the 89 345le,but switched to mid grade because of the rumers I've heard about the engine burning pistons. Right away I found that I get better mileage and there is no "run on" when I turn the engine off.
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Old 08-16-2003, 12:40 PM   #7
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I have been using mid grade for two years, and after reading this I guess i will continue to, its too bad its up to 1.60 gallon here, but the extra .10 is worth it. I am still getting 8-9 mpg, running roof air and towing my Saturn, so I feel pretty good about it.
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Old 08-16-2003, 02:29 PM   #8
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No low octane for me.
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Old 09-01-2003, 04:54 PM   #9
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Well the my personal results are in. The mid grade gas was well worth the $2.09. I had plenty of power going up and over mount Hood. the side benifits were better mileage, and lower engine temps. (cant figure the temp thing other than the engine didnt work as hard.) Now to go and post in the repair forum. Got to replace the leaky gates in my waste system. Yuck.
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Old 09-29-2003, 01:28 PM   #10
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I tow with a Dodge Ram 3500 8.0 V-10. The owners manual says "Use only unleaded gasoline having a minimum posted octane of 87."

Can it be harmful to use a higher octane than it calls for, or is it saying that is the minimum to use?

I've found in the past when I had the g-20 van that using a higher octane really helped with the power.

I've mixed it in the past and I can't say that I can tell a lot of difference it may increase the MPG somewhat. Does it help keep the engine clean, etc...?

Thanks,
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Old 09-29-2003, 02:08 PM   #11
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My Chevy 350 calls for plain old 87 too, however, my observations/perceptions was that using the 93 octane did have better throttle response and power.....

Now, I have my powertrain control module programmed for performance so 93 octane is now required in my car. I was in a pinch once and a rural place only had 87 octance. I took on a few gallons so that I knew I would not be out pushing and the engine, once the fuel made it through the lines caused engine knock. Back to 93 and all was well and happy again.

Eric
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Old 09-29-2003, 04:54 PM   #12
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I also have the GM 350. I use 93 octane when towing. Makes a 2 mpg increase and better pulling power.
When pulling my bass boat or just regular driving I still use the lower grade fuel.

Garry
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Old 09-29-2003, 05:08 PM   #13
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mid-grade

While towing I run mid-grade in my 5.3L 4:10 Silverado.

Regular when I'm running around town.

$1.46
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Old 09-29-2003, 06:44 PM   #14
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Garry,

I can tell you first hand that by getting your '96 a new air/fuel mixture program, you'll get about 10HP and a few Ft/Lbs of torque....then again you'd have to run 93 straight all the time and at $2/gal now....then again, few buy these thirsty beasts hoping for 30MPG!

Check out pcmforlessl.com. Bryan is a VERY straight shooting guy. You will be satisfied with his work.

Eric
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