Fattiest beef I could find (70/30 ground) is 1501cal/lb http://ndb.nal.usda.gov/ndb/foods/show/3960?man=&lfacet=&cou...
Using 4000gal/lb, this gives us a range for beef of 0.13-0.38cal/gal. To get to 1.0 you'd have to be using pure tallow
Fattiest beef I could find (70/30 ground) is 1501cal/lb http://ndb.nal.usda.gov/ndb/foods/show/3960?man=&lfacet=&cou...
Using 4000gal/lb, this gives us a range for beef of 0.13-0.38cal/gal. To get to 1.0 you'd have to be using pure tallow