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Being the cynic that I am I would doubt increasing an A4 diesel engine by 80 bhp would also increase the MPG as all the chip does is inject more fuel.
Fair enough if you go along at the same speed and don't use the "extra power" you should get more MPG.
I have an HDI Pug that is chipped up and does good MPG, but if I "murder it", it does less MPG !
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