Same here but not as intense. Last week my UG showed 35-40mpg at 55mph and 8°C outside and today it showed 30-35mpg, same road, same speed but - 10°C outside. I noticed on my UG that my intake temps went from 15-20°C last week to -4°C today.
I'll have to install a front grille block and flush wheel caps to keep the mpg down when it'll be minus 30°C.
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