I've got the 4JH4-TE on my boat and my fuel consumption is roughly along the lines of the manufacturer's specs. I haven't installed a gauge that measures actual fuel use but do log my hours/RPMs and rough consumption and most of my engine use is for motorsailing on passages. I've got a Gori propellor with the "overdrive" function; so that skews the consumption/RPM/load equations a bit, but overall I do see about 4 liters per hour @ 2300 RPM. It certainly guzzles quite a bit more than the previous Yanmar
engine I had, a 4JH3E 56HP model.