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