I would try this one first. They say you clean your k&n filter and over oil it it can eventually mess up something in your car. I have been impressed with this you can clean it and it’s a lot cheaper.I have a cx-5 2.5l turbo with over 44k miles and regularly see 19 mpg in mixed driving. I first tried 4 tanks full of 93 with no change in mpg. Then switched to regular gas with same results (at least 4 tanks).
I bought the CRC GDI Turbo spray. Had a friend in driver seat and keep throttle at ~2k rpm’s while I sprayed it (disconnect rubber tube from the air box and followed directions on bottle spraying away from MAF sensor). Afterward I noticed my MPG’s went into the low 20’s and increased throttle response with same driving habits.
I don’t work for CRC and I used the car’s own in dash mpg gauge to compare before and after.
I plan on replacing the OEM air filter with a K&N to see if it would help (Even though the OEM is still clean).
Finally, as others mentioned if you do short drives (under 15 minutes) it will hurt the cars mpg’s. As the car is not fully warmed up no matter what the dummy thermostat says in the car’s display gauge. Also, this turbo spools really quick so best bet is to ensure the car is shifting below 2.5k rpm’s. And I tried with and without traction control and made no difference.