Join Date: Jun 2015
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Did a muffler swap, total drop in MPG’s, driving mellow
Hello. I got a great deal on a Spintech muffler. It is 2.5”/dual in a s 3” single out. If you are familiar with the muffler, it has 8 “coils” in it. I love to Do a few full throttle on ramp runs a few times a week. I also will do some dorky hyper-mileage-ing on fwy trips. My mpg’s are lower than they have ever been. With just a Hypertech, I have got 17-19 on some fwy trips (factory 255 tires). Now it is low 14’s.
Initially I was flooring it a lil’ more often to near the noise, but not anymore.
I disconnected the battery for a reset too. Still the same.
Has this happened to others?
2015 SR5, Crew Max, 4x4, 5.7, 4.30's, factory spray-in liner, white w/black interior, Hellwig rear bar, Hypertech, Bilstein 5100’s, middle setting.