Just a guess; One of the reasons You married him is he is likely reasonable and productive, although his methods seem strange at times.
This is how city people see country folk.
If your husband was raised in the country, he likely is working well within his knowledge base.
Trust his sage wisdom in use of the deisel fuel.
After 24 hours of the burn off, If you open the door and smell deisel fuel, he used too much. If you can't smell deisel fuel the next day, it will be okay.
Grow, eat, and enjoy the country life.