The fuel state sensing device has an air mixing state calculating section for calculating {HEAD ~ a quantity} or a ratio of air mixing in the fuel as an air mixing quantity or an air mixing ratio based on the sensed bulk modulus and {TAIL ~ the sensed fuel temperature} 
The fuel state sensing device has an air mixing state calculating section for calculating { HEAD ~ a quantity } or a ratio of air mixing in the fuel as an air mixing quantity or an air mixing ratio based on the sensed bulk modulus and { TAIL ~ the sensed fuel temperature }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL