What Octane?

[Bantan]

Just curious to know, What Octane gas do you use in your VX?

[Cyrk]

93 for the Supercharger!!

[AlaskaVX]

92 is the highest octane at our pumps. In fact only Chevron carrys 92 so it's the only place I fill up, everywhere else is 90 premium.
Supercharged

[Dallas4u]

I'm supercharged, and I've been using 87 for a while... I just don't feel like buying premium every 270-280 miles!!!

I will, though, put in premium every once and a while... and will definitely go back if the price of gas drops at some point.

[Tone]

87 is what the book calls for. Supercharger recommends 91+ but our kncok sensor is able to handle the lower octane (with noticeably less power) without damage for those with the SC trying to save money...

[MZ-N10]

phew thought i was the only one getting 300ish miles on my vx....
________
The Sanctuary of Truth Pattaya

[Hotsauce]

I buy 93 octane. If thats whats actually dispencing or not is another story.

You can run with lower octane, but you increase knock count. Once knock count reaches some limit the ECU retards timing. It takes 4 degrees of retard to quench the knock of 1 degree too much timing.

More timing gives more power and mileage. Some of you have posted in the past that you get better mileage from resetting the ECU. This is reseting the timing table back to zero. You should not have to do this if you have enough octane to keep the knock sensor happy.

I'm guessing that you can go farther per dollar on the higher octane because of the increased timing.

It would be very hard to prove this without running several tankfuls of each gas through to get the ecu set to each gas. Resetting the ECU gives the lower quality gas a temporary mileage advantage.

John C.

[SPAZZ]

Use mostly 87...but when 85 is available my VX loves it...gets better mileage and performance

[AlaskaVX]

spazz

[VX_PA]

Just don't want to take any chances with lower octane fuel. It may seem to cost a lot, but it's still cheaper than throwing down another 5 grand for another motor. My VX is my hi-dollar ho.

[joe-yamma]

I notice better performance and slightly better using higher octan. I usually use 89, but I'm probably gonna start running 93 all the time.

Joe

[Navigator]

...For some reason I can't explain I keep buying 93 Oh yeah, I get more GittyUp That's the ticket !

[powered by isuzu]

I see by the results of this survey that most of us can't afford high octane......what is up with the gas prices!!!!

[Bantan]

Originally posted by powered by isuzu
I see by the results of this survey that most of us can't afford high octane......what is up with the gas prices!!!!

Actually Guys, the reason I started this thread is becauce the service manager at my Isuzu Dealer told me recently to stop using 93 octane. He also switched my VX from synthetic oil (which I've used from my first oil change). I believe his exact words were " this engine wasn't built for 93 octane gas or synthetic oil, it will run smoother and better with 87 and regular oil".
Is this BS?

[VX_PA]

High octane gas and synthetic oil will not hurt your engine. However, 87 octane gas and regular oil will not hurt your engine either. It was designed for 87 gas and regular oil, but better gas and oil are better for your engine. There are plenty of tests and written facts to back up my statement. Can your mechanic provide in writing tests that back up his statement?? Until he can, he's full of BS. Anyone else??