6.67 L/100km - 15km/L
Picture of my grill-block that I ran still stuck on my phone, but managed an average of 6.67L/100km over a 1251km trip with a bike rack and bike on the back; speed mostly 110km/h. Pretty much all highway miles 34mpg US / 41mpg UK.
Unfortunately my average overall consumption is climbing to 8L/100 because where I live now includes a lot more suburban travel and very little highway travel through a week.
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