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I changed the oil/filter and the back tire of my Sv650s about 600miles ago. Since then I have noticed about 5- 7 miles/gallon decrease in gas mileage.
Suzuki oil/filter was replaced by Mobile1 synthetic and generic filter. The rear tire is the same. MEZ4
My riding style haven’t changed and the commute is pretty much the same. The only difference is I am getting gas at different gas stations. I doubt that’s the problem since I have tried 3 or 4 different gas stations already. Same results at all of them
Any idea what cause the decrease?