$17.60 equates to 13 litres. half of 13 litres is 6.5 litres, 86km divided by 6.5l = 13.23 Km/l If you consider half full being half way to where the fuel light comes on. This is not very scientific as you say the bike used half a tank of gas and do supply any info on how many litres it took to fill from this point. What I'd suggest is that you reset the trip meter every time you fill up and record the distance travelled at the next fill, divide this distance by the number of litres it took to fill and that is your Km/l. Much more accurate than looking in the tank and guessing where half full really is as due to tank shape what looks like half full may really not be.
Andy.
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