My turn now
Ok, so it's been 24 hrs since FSA 12B37 and I went for a highway ride after diner.
Got a fresh new tank of Shell reg fuel
Reset computer to zero
Hit 110 KPH (68 MPH)
Minimum AC on 23° Celcius
I got 6.0L/100Km or 39.2 MPG
Comming back home I tried to slow down a bit and tuned the AC off
Going 102 KPH (63 MPH)
No AC, only minimal regular vent
I got 5.4L/100km or 43 MPG
These are the best numbers yet as I did this test with the first Hatchback I got in nov '11 and this Sedan. The best I could acheive was with the Hatchback and got 6.2L/100KM
But honestly..Who drives at 100 KPH these days? I kinda felt like some obstacle...and the look on the face of people passing me were like ''WTF man, move!!''
I'll update with more realistic numbers from my daily commute.