Scott,
Now that's what I like about the LML. I asked a question and in less than an hour someone provides an answer. Thanks.
So using this info in the previous scenario, a 10% change in cooling load would result in a 2% change in total drag. I like fast with payload, so I probably wouldn't be a diesel candidate. But 2% more drag is certainly not the end of the aviator's world. Even at full power a diesel is typically 3-5% more efficient than gas.
Rob