Ok, tried another program. Apparently I was converting from "troy" pounds & ounces to grams instead of "avoirdupois" pounds & ounces to grams. Who knew there was a difference!!!!!
New converstions
RS4-2- 3.72 lbs= 59.52 oz= 1687.36 g
MTX-2- 4.15 lbs= 66.4 oz= 1882.41 g
MTX-3- 3.80 lbs= 60.8 oz= 1723.65 g
Now that looks more like it!!!!
JWF your cars would be:
61.8 oz= 1752g
59.1 oz= 1675.46 g