YTK: I think what you are experiencing is that it is difficult to consistently fill the LT's fuel tank. Its very sensitive to how far the bike is tipped. That will have a great impact on your gas mileage calculations for each tank. If you figure your average over several tankfuls, that would be more accurate.
The mpg displayed on the trip computer is not necessarily accurate, but you can calibrate it yourself. There is a procedure in the owners manual on how you can adjust it. Again, however, I recommend you manually calculate the mileage over several tanks of fuel, before making the adjustment.
There is some confusion in the responses above, between the avg mpG, and avg mpH displays. Your original question was about mpG.
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