Going back to check the previous exhibition season the fuel multipliers aren't actually much lower this season. Last time it was x2 for six races, x3 for three races, and x5 for one race. This season it's 1x for three races, x2 for one race, x3 for one, x4 for one, x5 for one, and x6 for one. If you average it out it's actually higher this season.
The races are much shorter though, which makes for less total fuel used even if the multiplier is higher. I think gas guzzlers will still have a hard time this around too, but not as much as cars who are hard on tyres
I think finally we'll see a slightly more even playing field with FFs in Gr4