That is just about exactly what I'm getting, 68 MPG. I was told by the guy I bought the bike from to run 92 octane in her. Anyone having issues with the 87?

 

47,000 miles of 87 octane. Nothing to see here.

 

I've never noticed a difference between 94 and 87 octane in my bike. I usually run 94 when I can just because the price isn't much different on such a small amount.

I don't imagine our bikes are running the same kind of compression and timing advances that race bikes see.

 

The lean surge problem I had with my bike before upping the main jet size to DJ140 from DJ132 was exacerbated with high octane fuel and minimized when switching back to 87 regular. Some day when I get a new piston and raise my CR from 11:1 I will need premium gas.

 

Are their higher compression pistons available for our bike?

Would there be benefit in doing that?

 

Dunno if anything is available off the shelf. Higher CR yields increased thermodynamic efficiency, meaning more power or fuel economy. Probably less bang per buck compared to a BB351 kit. Probably less power and strain on the rest of the bike though. I would def like 80 mpg with a little more power. Maybe I can shave my cylinder head for the same effect.

 

unless your filling up from a dedicated tank, or nozzle at the gas station you will be receiving up to 1 gallon of what the last person bought, since thats whats sitting in the lines

Since the bike holds so little it will be such a small amount diluted in whatever fuel was left from before

and unless you have a high compression engine " you would know this if you do" anything but what is recommended in the service manual to use will be wasting money which I believe is 87 octane

 

In Canada, many 91 octane pumps are ethanol free (at least at Shell). I use it in all my small engines and in the bike in the fall because I know it's going to sit for a while. I've never had problems starting up in the spring with gummed up carbs since.

 

Almost all the pumps in Canada have a separate pump for premium.

 

I seem to get terrible mileage. All stock 06. But I ride a mix. I'll ride to work 2.5 miles, ride to a friends house 10 miles on pavement, ride the trails and his little mx track (slowly klx doesn't like big air) maybe 15 miles of that, then taking the wood trails(5 miles) from his house to the camp.

Comes out to about 30mpg.