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I have had the MPPK on my car since December, honestly only drove it stock in Europe when I did euro delivery and had it installed before I picked it up so I cant really tell if there is a huge difference. However to comment on kiankur11's notes on MPG, I now have 20K miles on my car and have averaged upper 20's the whole time while regularly achieving 30-32 on the Highway. I think the difference you are seeing might come from city driving where they have increased the aggressiveness of the throttle and also increased the amount of fuel being dumped into the engine. The power needs to come from somewhere. IF you drive conservatively your mpgs will not change, but driving spiritedly will use more than stock. Just my 2 cents.
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