I have a ScanGauge, and I used to record the info every time I filled up my tank (or occasional long trip). Although doing regular motorway driving my average of the average mpg over 150 recorded sessions was 33 mph. The highest was 42 mph (lowest for a mainly city driving trip was just 17 mph).
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2009 Skoda Fabia Elegance 1.4 16V
 
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