more efficient
less efficient
equally efficient
unperdictable
more
less
same
more/less depending on capacity of engine
1 sec
0.1 sec
0.01 sec
0.001 sec
piston ring and cylinder wear
formation of hard coating on piston skirts
oil sludge in the engine crank case
detonation
using additives in the fuel
engine derating i.e. reducing the maxi-mum flow of fuel
increasing the compression ratio
adherence to proper fuel specification