I will second the fact that the gas mileage improves with a few hundred miles on it.
Not sure if this is during your break in period still frequently changing RPMs ...etc But that obvisously will put the hurt on the MPG.
I think as the engine loosens up a bit the MPG will go up also. Thats what i would attribute it to.
mine is fairly solid 21-24 on trips....around 19 around town mixed.
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