inliner311
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So I perused the Jag forums and a proper tuning up and a pulley will bring the 2013-2015 Jaguar XFR from 510 HP to 630 HP.
Which is a considerable and insane upgrade.
What do these things do to your milage?
It really shouldn't have much of an effect on your MPG if you don't have a lead foot. Like if you can keep from gunning it during normal daily driving, you won't notice much of a difference.
My S4 has the ability to switch programs and I actually get better milage with the chip program vs stock. It's a stick and for city driving I can put it in a higher gear because of the additional torque.