Depends on alot of things.Ambient temperature,product temp when loaded,condition of coolin system and type of unit,condition of trailer.Could use alot more fuel if any of these are below normal.What danc694u said is close if everything else is normal.
What he said. And be sure that you make sure your fuel guage on your reefer tank is working properly as well so you dont run it out of fuel. Believe me it can be a pain in the hind end if you run it MT. So if you look in your mirror and see that it shut itself off. Pull over and shut it off because it will try to restart itself 2 or 3 times completely draining your fuel lines thus making you have to use that nice huge primer pump..ha ha ha.. Most reefer trlrs have 50 gal tanks. Ones that go on rail cars have 150 to 200 range.
tell u we have a 50 gal. tank and usually use around 13-17 gal, per 24 hrs
depending on conditions and product like produce needs continues but typical frozen foods can run on start stop mode extending the length of how much fuel it burns
Like someone mentioned about making sure the fuel gauge works,make sure you have a small but bright flashlight so you can pop the cap off and look in there to check.Don't rely on that little needle when you pick up a trailer.I usually would pick up a trailer and go top it off to make sure.