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Originally Posted by shakran
In short, if you take an engine and increase its power output, you will increase its energy intake, which boiled down means more power = lower fuel economy.
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It's possible to get a compromise on a turbocharged car, but you trade economy and performance for reliability. The APR performance tune for Audi/VW 1.8T engines kicks you up by about 60hp and torque, but you also go up to around 35mpg if you cruise at 70-80mph (this is according to my former boss who had it done to his Passat.) By changing boost and injector timing, you can make more efficient use of the fuel at the cost of wastegate life span (but there are aftermarket parts designed specifically for this application to solve the problem.)
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Originally Posted by LoganSnake
How much did it cost? I wouldn't mind getting that kind of an upgrade at all.
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Looks like exactly what I'm talking about. Costs $600 around here.