Table:
text: Bill Vukovich
Complete Formula One World Championship results
Complete Formula One World Championship results
Year_ Entrant Chassis Engine Points
1950 I R C Maserati Maserati L4 0
1951 Central Excavating Trevis Offenhauser L4 0
1952 Fuel Injection Kurtis Kraft KK500A Offenhauser L4 1
1953 Fuel Injection Kurtis Kraft KK500A Offenhauser L4 9
1954 Fuel Injection Kurtis Kraft KK500A Offenhauser L4 8
1955 Hopkins Kurtis Kraft KK500C Offenhauser L4 1

Question: Before 1955, which competitor with an Offenhauser L4 engine and a Kurtis Kraft KK500A chassis scored 9 points under the results of the entire Formula 1 World Championship under Bill Vukovich?

Question: What type of engine did the Fuel Injection competitor use for Bill Vukovich's complete Formula 1 World Championship results?

Question: What is the average score for an Offenhauser L4 engine with a Trevis chassis in Bill Vukovich's Formula 1 World Championship overall results?