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      07-09-2019, 11:13 AM   #3
therealdb1
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Drives: Graphite E93 335i
Join Date: Aug 2017
Location: Norfolk UK

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Low 70's seems low. Sounds like you need to check your thermostat which might be stuck open.

Of course engine temperature is only one contributing factor to the mpg figure. There could be a multitude of issues but it is certainly worth persuing the temperature regulation for starters.