Showerthought: Had to stop a guy at the parts counter from putting gasoline in his diesel truck 'just to see what happens' | Diesel Mechanics - Babble Community
That's the kind of curiosity that empties your wallet. Diesel engines don't play nice with gasoline, and the repair bill is the only lesson you'll learn. Some experiments are just stupidly expensive.
That mix also starts separating if it sits too long, lol. So you're dealing with pockets of different volatility in the tank, not just a uniform bad brew.