There is a guy near me who has a truck he built - 4 door Dakota on an F-150 Chassis and a 4 cylinder bread truck motor. When I met him he was just retuning from Minnesota with a gooseneck trailer hauling a 39 Ford 1 1/2 ton dually he'd bought. Said he got 22 on the trip back, usually got about 30.
I've driven my Dodge Cummins diesels probably 400,000 miles in the last 10 years. Once in a while I replace the fuel filter. I've had one time on the road where it was a problem, and it was obvious it was fuel starvation when you pushed it hard. I changed it that time in a parking lot, took off with no problems.
I've also done probably 10,000 in my diesel powered sailboat. Small 30 hp motor. I've had more problems there, as often fuel has been sitting a long time, but again, changing filters is all that has been required. On the boat, once more than one a day, but that is running 24 hours a day.
Fuel problems are just not a part of the equation. You might not like diesel for a lot of reasons, but worrys about fuel quality is just not a reason to worry. In addition, diesel will last far longer in the tank than gas. Years.