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Is anyone running VP racing fuel, and if so, what type?

I'm asking because I have been in frequent conversations with the guys from VP (Terre Haute Distributor) and they have all said (talked to three different representatives) to use the U4. I have inquired about the C12 fuel, but they all said you would be better off running the 93 octane pump gas. They also stated that the four stroke motors do not respond well with HIGH octane type fuels, thus the reasoning they are pushing the U4 fuel.

Just looking for some insight here guys.....

Thanks
 

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I just use regular 93 from BP only. I have some bad times with other companies.
 

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93 also
 

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i been running a 50/50 mix of c12 and 93.i would stay away from the u4 it is highly oxygenated and from what i hear has been causing some problems in the fi.did the same thing in dales.bad for the components
 

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yep 50/50 works well, when i ran pure vp race fuel in my dirtbikes, spark plugs were bairly lasting one day, then i used half and half and it ran great but then Race fuel got exspensive.
 

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50/50 VP110 & 91 pump, runs perfect.
 

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91 here.
 

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91 for me, I did a post in here where we dyno'd my bike with 3 different fuels, 91, c12, u4. with the c12 I lost almost 1hp and with the u4 I gained 1hp over the 91pump gas. the u4 is very expensive and if you do alot of "play riding" stick with the pump and keep your money in your wallet!
 

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I have run the U4 in my ltr before and it ran really well with it..However, when I got my Power Commander, I switched back to regular supreme pump gas because I did not want to ALWAYS buy the expensive U4! I recommend U4 to someone who rides a lot and who wants to mainly race.
 

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If I remember correctly, the U4 was the worst gas to run being that its oxygenated. Although it is great for power it reeks havok in your engine. It is not that high of an octane like C12 or even AV gas. It leaves some serious deposits in your head. So yes you gain performance. In the long run you loose it due to excessive build up. Additionally, all that extra work you will need to get the junk out.

U4
Used in stock and modified 4-stroke applications, as well as stock 2-strokes. Makes up to 6% more power than pump gas and any basic nonoxygenated racing fuel. Passes fuel rules for AMA amateur racing and is also perfect for club level racing, CCS, WERA and AFM. For optimum horsepower and performance, do not store this fuel in vehicle — drain fuel system.

• Color: Clear
• Motor Octane: 92
• Specific Gravity: .718 at 60° F

C12
The best all around racing fuel made. Recommended for CRs below 15:1, satisfying the needs of 75% of today's race engines. One of the winningest fuels in racing history, including Modified Tour, GNN, D.I.R.T., Indy Lights, NHRA, AMA as well as other local and national championships across the U.S. and around the world.

• Color: Green
• Motor Octane: 108
• Specific gravity: .717 at 60° F

Don't leave ANY 100% race fuel in your tank....pump gas or bare minimum 50/50.
 

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I was contemplating on running a 50/50 mix. Has anyone run Klotz fuel? And running 50/50 will this cause filter issues?
 

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I was contemplating on running a 50/50 mix. Has anyone run Klotz fuel? And running 50/50 will this cause filter issues?
[/b]
If any gas is gonna cause filter issues its gonna be pump gas....that shit is contaminated with dirt, water, oil etc etc.

I run straight C12....I have a 14.1 piston though and mines mainly a duner so the price dont kill me....5 gallons lasts a month.

Oxy fuels(U4/U2/MR9 etc etc) are fine if you use them right...i.e. do not leave them in the tank and burn a little bit of un-oxy fuel through your system before you shut it down for a while. They SUPPOSEDLY leave deposits in the head...after a while of use...Ive used at least 30 gallons of U2(same as U4 but 101 octane instead of 91) in my bike and dont have any deposits yet.

Not saying oxy fuel dont eventually leave deposits but its apparently gonna take a while.
 
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