This is how it was designed to work:
Whats Going On As I Drive?
Did he recently get it or has he had it a long time and the car changed while he had it?
41 MPG? Maybe someone put cheap high rolling resistance tires on it?
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2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)