If the fuel somehow ends up in your personal truck or the family boat then no. If you are truly honest about your expenses, then kudos to you. I hope you are very successful.
All I tried to say is that cash enables some people to skirt the system which places more burden on those of us who can't or won't cheat.
I also know many businesses pay for travel, property, vehicles etc which are used almost entirely for personal use and then used as a deduction to avoid legitimate taxes.
I'm not anti small business or for big government. Our government takes too much from the doers and spends too much overall. But you gotta admit there is some unfairness in the system.
Hell, I love Trump. I think I know why they want his taxes, and he doesn't want them to see them. I'd bet he paid very little or no taxes. He might even have gotten money back. But I do not blame him one bit. If my hunch is correct, it's the system in place that allowed it.