RedEx.

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Try doing this to yer fueller...........

Hey, anything is better than my V6 and V8 yank tanks, but still, I'm not complainign about the number, I'm curious as to whether I have a problem as it is so low in comparison.

I guess I'll just take it for a motorway ride and see if I can get the 180 miles out of a tank, see if it can do what I expect of it, and then just put it to 'not being as good in traffic'.


For you Bonzo, my XB9 got 45mpg (15.9303km/litre) round town and could get 60mpg (21.2404km/litre) on a long haul. I still buy my petrol in litres, but my Buells always have a converter fitted, so it turns the litres into gallons for me (pretty good conversion rate) so I work it out in mpg, rather than km/l, y'know, cos I'm English, not a modern European.

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Life moves pretty fast. If you don't stop and look around once in a while, you could miss it.

Well bugger me, we thought you were a septic

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Wear the fox hat

I'm not septic

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Life moves pretty fast. If you don't stop and look around once in a while, you could miss it.

*Other brands of Upper Cylinder Lubricant are (or were) available

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'98 M2 Razorback, it's a keeper.

My theory on this is that good mpg is a matter of optimising supply to match the minimum required demand. .....obviously, but that the design of some machines is better optimised towards this than others in terms of torque available on part throttle to make good progress. As it happens longish stroke motors with only 2 valves turning slowly are quite good in this area. Multi valve motors give larger influx of mixture at initial valve opening due to a greater total valve circumference so can in theory give a greater charge at low revs, but it is all to easy to over gas it, while longer strokes give higher piston ring speed for a given rpm and automatically have an enhanced compression process at lower revs for whatever mixture has entered the cylinder. The bigger crank throw in a long stroke motor can also provide a better turning moment for a given amount of cylinder charge, hence can be significantly more frugal than your sportier short stroke motor when mixing it in commuter traffic. This is also providing the long stroke machine is not too heavy and has an optimum set of gears to make the best of torque multiplication. Out on the open road at legal cruising speeds the differences between engines is less and the long stroke designs can be noticeably more thirsty when driven faster as they become less efficient at wide open throttle. In my experience. Better explanations or notes to the contrary by those more qualified are welcome as my head is now hurting.

Different horses for different courses
You can buy a 500 BHP car that will get you from A to B quickly
You can also buy a HGV lorry with 500 BHP that can pull 44 tonnes .
Although in this instance when being worked hard , each probably only returning a couple of miles to a gallon

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Buell Ulysses XB12X 06/08

Having said all that, Despite being of a similar displacement, weight, and overall gearing, a friends KTM 990 on a longish run still seems to guzzle the gas 20 percent faster than my XB no matter how smoothly you ride it. ''Tis fast though!