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