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Doesn't mess the obc up like many do.
The reason you see improved mpg is because you have more torque and don't have to push the car so hard during normal driving, then when you are cruising it holds back the fuel slightly, so you see a slight increase.
Use the power though and it will use even more.
My 120d (163bhp) was and auto and I saw very good gains in consumption.
177bhp 320d auto didn't see any gains in consumption, but good power gains.
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