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Base fuel modifiers for fuel items (acceleration, top speed) are increased by quality modifiers normally (eg, solid fuel acceleration boost, 120% becomes 126%/132%/138%/150%), but the documentation says that fuel_acceleration_bonus_quality_modifier and fuel_top_speed_bonus_quality_modifier should default to 30% of that value (which would be 120%/121.8%/123.6%/125.4%/129%).

Thanks for the report however I don't understand what you're saying.

The documentation states:

Additional fuel top speed multiplier per quality level. Defaults to 30% of fuel_top_speed_multiplier - 1 if fuel_top_speed_multiplier is larger than 1. Otherwise defaults to 0.

https://lua-api.factorio.com/stable/pro ... lity_bonus

For uncommon solid fuel that comes out to: boost = 1.2 + ((1.2 - 1) * 0.3) or 126%

30% more of *the boost applied by the fuel* is what it gets - which is correct.