When you do testing, use the fuel data given to you from there, and add about .05 for comfort. So if your TD tells you that you can go one lap with 4.20L of fuel, make it 4.25L and multiply it by the amount of laps you plan to do for that stint. The numbers are a little off right now, so if it says one thing or another, don't listen to it, and just trust your own math.
@Michael : Sometimes there is a bug when you are at max FE (fuel eco) for your first test run, you have to do more test runs and check in-game fuel prediction during the race.
I noticed a couple of days ago it suddenly stopped working using the default browsers on both my Samsung Galaxy S7 and my Samsung Note 10 tablet and it hasn't worked since. The Forum does work but the game doesn't.
The work around for me is to use Google Chrome on both of these devices, this allows me to set strategy, repair cars, hire and fire staff... everything except manage the races live.
Hmmmm...... I will download it. I couldn't access it using Firefox either. Strange - it's stopped working on safari and Internet explorer at the same time...
For me it's all working okay on Win 10 laptop browsers (Firefox, IE & MS Edge), it's only the default browsers on my Samsung devices that don't work. As I said above, all was fine until about two days ago. All a bit frustrating as I like to check stuff at lunch time and the computers at work are set up to block on-line games such as iGP meaning I have to use my phone.