22 mpg sucks

no power commander and nothing done but the 4 to 1 full akrapovic exhaust. stock wheels and rubber. all i have done is the 17 43 tooth. im still at a loss on what could be doing this. what rpm should i be at when in top gear doing say 55mph
 
no power commander and nothing done but the 4 to 1 full akrapovic exhaust. stock wheels and rubber. all i have done is the 17 43 tooth. im still at a loss on what could be doing this. what rpm should i be at when in top gear doing say 55mph

The +3 rear sprocket has only raised the rpm's around 600.
 
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