You forgot to mention: roof rack removed! I'd bet that was the single biggest factor affecting your MPG.
Originally Posted by Codylehr23
I did a test on my 1.0L 3-cylinder Metro (Firefly), and an empty rack like yours reduced my MPG by ~12% at 50 mph. The effect gets exponentially worse the faster you go. Eggman wasn't kidding: roof racks wreck fuel economy. They increase both drag AND frontal area.
View my fuel log 2014 Mirage SE 1.2 manual: 56.0 mpg (US) ... 23.8 km/L ... 4.2 L/100 km ... 67.2 mpg (Imp)