Chris
I did practice which resulted in medium and hard having a rate of 2.7, on every run for both drivers. SS were 2.6. I ran medium and hard for the duration of 48 laps @ 2.7 which equates to 129.6L so i put 130L in. I ended the race with 4.4L over after it ran on PL3 at 2.6 the entire race. I get i don't get to see the hundreths column now, but if it was 2.74 for example that would put me at 1.5L under-fueled. If it was 2.68 for example and rounded up that's only 1L over. TD is a lvl 29. What's going on?
This happened also to me several times this season after the update.
I had one decimal difference between SS/S and M/H.
Always ended up having way too much fuel at the end of the race.
Now i only trust the formula in my Excel sheet.
From my experiences this season, i would give you the advice to trust the lower fuel consumption, if you dont have any other information sources or a TD with special ability fuel.