Hi to answer your question about a gas version 1/2 ton it will be depending on your foot. My experience so far with my gas 3/4 ton pulling 10k is 7.5-9.0 depending on how fast I drive. Usually I pull 65-70 on the interstate which yields 8.0-8.5 if in the hills then it drops to 7.5-8.0 depending on speed. I have seen 9.0 when around 65 in Florida where I live. Diesel will yield some more but again 11-12 mpgs with current emission controls, that’s what my parents get with there Cummins. A newer 1/2 ton can pull what your asking it to do. Comfortably you would be better served with a 3/4 ton gas, you don’t need a diesel for that weight . Daily driver plus towing duties I can see where a 1/2 ton would work better. So I lesser weight camper like 8k max included loaded would be good. Of course the it all depends on what 1/2 ton you buy so your capabilities of weight capacity can go up. Do your research on the newer 1/2 tons for sure. I think that they are really impressive for what they are designed to do. Hope this helps, good luck and let us know what other questions that you may have as your trying to decide.