Table:
text: Roberto Mieres
Complete Formula One World Championship results
Complete Formula One World Championship results
Year_ Entrant Chassis Engine Points
1953 Équipe Gordini Gordini Type 16 Gordini Straight-6 0
1954 Roberto Mieres Maserati A6GCM Maserati Straight-6 6
1954 Roberto Mieres Maserati 250F Maserati Straight-6 6
1954 Officine Alfieri Maserati Maserati 250F Maserati Straight-6 6
1955 Officine Alfieri Maserati Maserati 250F Maserati Straight-6 7

Question: Among the full Formula 1 World Championship results, which competitor had a Maserati 250f chassis in 1954?

Question: What is Roberto Mieres' highest score before 1954?