[HypermilerAX]

No, I can't make it work properly yet (return line to the tank makes it more complicated). If I can't at all, I'll make tests this fall and measure the volume manually by pumping the diesel out of a jerrycan. I can then weigh the jerrycan with 1 g precision before and after the test and calculate volume with volumic mass. That would give me 0.01 l/100 km readability over 10 km.

My first tank with the last shown aeromods returned 2.74 l/100 km by driving a tad slower than usual too (50 mph cruise speed, occasionally slower if slower vehicle). I'm a bit dissapointed but I had a lot of wind everyday. It's a strong wind that blows by gusts so I had nowhere near as much tailwind than I had headwind.