25 mpg = 9.41 l/100km
50 mpg = 4.70 l/100km
75 mpg = 3.14 l/100km
100mpg = 2.35 l/100km
I wouldn't expect him to embrace the l/100km measurement, but it might help see how a 25mpg improvement isn't as mind blowingly difficult to attain at the level of your insight vs a full size truck
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