Hi guys, I'm a little worried about my lowered mpg after intake filter replacement + oil change from the dealer @15k interval maintenance.
I have a 2013 WRX Sedan with roughly 17,600 miles. I had an oil change and intake filter replacement around 15,800 miles and since that time I have been experiencing a loss of mpg 3-4mpg. My driving has not changed at all I commute roughly 60 miles per day mostly highway miles with 25.3 mpg average. Since, I have had the work done I have only been getting 22mpg. I don't drive the car hard at all and it has the summer tires on with stock rims both OEM. I am located around Albany, NY area.
Any idea what it could be , I have had this work done at the dealer. I am worried they might have put regular oil instead of full synthetic. I have always used 93 Octane on this car and have been following the maintenance manual for all the routine stuff. No mods everything stock.
Please help I'm OCD about this stuff .