thats RESEARCH octane not PUMP octane .THe f4i has a RON rating of 91 also but uses 87 PUMP octane.

Gasoline pumps typically post octane numbers as an average of two different values. Often you may see the octane rating quoted as (R+M)/2. One value is the research octane number (RON), which is determined with a test engine running at a low speed of 600 rpm. The other value is the motor octane number (MON), which is determined with a test engine running at a higher speed of 900 rpm. If, for example, a gasoline has an RON of 98 and a MON of 90, then the posted octane number would be the average of the two values or 94. High octane gasoline does not outperform regular octane gasoline in preventing engine deposits from forming, in removing them, or in cleaning the engine. Consumers should select the lowest octane grade at which the car's engine runs without knocking. Occasional light knocking or pinging won't harm the engine, and doesn't indicate a need for higher octane. On the other hand, a heavy or persistent knock may result in engine damage.

 

I always run the highest octane of 93 whenever I can. I really don't care about saving 20 cents a gallon, it only holds 4.9 gallons.

 

160+

 

yea i putabout $10-$15 of gas in my truck (94 silverado) everyday... and i do the least amount of driving possible... so i def. dont miine 10-20 cents extra when im only gonna pay around 10 to fill up and last a week lol.

as far as how many gallons/tank i get, idk yet i just got my bike and havent used a full tank yet but i hope its up there with some of your numbers

 

I get 100- 115 till the reserve light comes on then i always fill up. All stock except the exhaust.... dunno y but it runs great.

 

Last time i got that low MPG per tank was a weekend of mountain riding (high rpms most of the day).

 

How does the PC affect the mileage?

 

does having the -1/+2 sprockets get you worse gas mileage?

 

Yes it does, I had stock and was getting like 150 miles per tank in town, and I did -1 in the front and I only get like 120 in town now. But a small price to pay.

 

Mine actually went up,but mine has a custom map and i kept the 02sensor.

with all my mods i still get a average of 150 per tank.