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post #1 of 10 Old 09-21-2006, 05:07 AM Thread Starter
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First I need to say my '72 F100 with a 428 cobra jet only gets about 4mpg. It's the reason I purchased the bike for my commute. With that said I noticed the speedo error. If you haven't changed sprockets your indicated mileage will be wrong. I'm running a 17 tooth counter shaft sprocket a PCIII/USB and get right at 47mpg on 93 octane. I have not gotten a good check of my speedo yet but I have driven with some pace cars and it seems close to right

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post #2 of 10 Old 09-21-2006, 05:10 AM
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You want to save some more $$? Change over to 87 octane, the 919 will run just fine.

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post #3 of 10 Old 09-21-2006, 05:53 AM
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Originally Posted by m51142 View Post
You want to save some more $$? Change over to 87 octane, the 919 will run just fine.
+1

My EX500 ran better with cheap stuff than premium! I didn't believe it till I tried it.

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post #4 of 10 Old 09-21-2006, 05:55 AM Thread Starter
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It's not about $'s I am running the 93 octane because of the increased engine load with the higher grears (low speed throttle). The gear change makes going to second a real kick when you want on the highway. Makes those lane changes more fun.

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post #5 of 10 Old 09-21-2006, 06:06 AM
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Try a tank of cheap stuff, I bet you won't tell the differance. The gearing change shouldn't create any knock.

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post #6 of 10 Old 09-21-2006, 06:33 AM
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+1. Octane is only knock resistance. Knock is a function of compression, timing, and sometimes altitude (I think).

If fuel quality is the same, you actually get miniscule better performance with lower octane. Lower octane fuel is easier to ignite.

If your bike does not knock on 87 octane, you are wasting money on higher octane.
David

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post #7 of 10 Old 09-21-2006, 09:14 AM
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Originally Posted by djs_tx View Post
+1. Octane is only knock resistance. Knock is a function of compression, timing, and sometimes altitude (I think).

If fuel quality is the same, you actually get miniscule better performance with lower octane. Lower octane fuel is easier to ignite.

If your bike does not knock on 87 octane, you are wasting money on higher octane.
David
+1
How many times does somebody need to say this before people quit wasting money on high octane?

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post #8 of 10 Old 09-21-2006, 09:40 AM
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It's human nature...

High dollar, high performance vehicles often require high octane. So people often assume that high octane is "better" because "better" vehicles require it.

Now some people claim that premium fuel is "cleaner" than regular and has less impurities. I've never seen anything factual one way or the other on that. I've seen people that claim to work in refineries that claim the premium and regular come from the same tank and they just do some extra steps to raise the octane on premium.

It used to be years ago that Chevron only put Techron (their excellent FI cleaner) in the premium gas so I would occasionally do a tank of premium for the FI cleaner but now all grades have techron.

David

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post #9 of 10 Old 09-21-2006, 09:47 AM
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It's a little known fact that all the gas comes from the same pipeline.

Every station and every octain is the same just with different additives.

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post #10 of 10 Old 09-21-2006, 10:05 AM Thread Starter
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With me it's habit. I own several fast cars one with 13 to 1 compression and I just put high octane in everything. I will try the lower octane and see if the faster burn rate is OK.

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