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Before the aero mods I could get as good as 67mpg at 53mph average speed and at 75mph average speed I would get 57mpg. after the aero mode I get 67mpg at 75mph and 71mpg at 63mph. At this stage I do not have a large enough sample size to be confident of my numbers. I am using the trend in my fuel log as my test, so until the number of entries gets to about 30 or so with a strong trend line I won't be sure. By some peoples standard this is not a very good test of aeromods, however my objective is fuel economy so this method works for my perposes.
On your cbr600 I would agree with you that a gearing change would help fuel economy. However you would have to accept a loss of acceleration and top speed in 6th gear. On my GS500F after the aeromods and gearing changes, one of the things I notice is I need less throatle to maintain speed on the highway at 75mph. The other thing I notice is that top gear acceleration is better than before the mods. These are subjective so a grain of salt is in order, until the sample size on my fuel log is large enough, and the average fuel consumption is better.
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