ATV-TALK A Motorsport Podcast · Leonard Duncan

SHOP TALK with Leonard Duncan: "Real Gas vs. Modern Day Pump Fuel"

January 13, 2026·57 min·5 clips

Leonard Duncan reveals his 3.5-hour argument with ChatGPT over hidden truths about modern gasoline.

Leonard starts with gasoline, and he does not pretend it is a polite topic. Riders have opinions, but fuel also gets into carburetors, fuel injection, performance, and the kind of failures nobody wants to pay for. This is shop talk in the literal sense. He is not trying to settle the argument with a Google or AI answer. He leans on a career spent around gasoline, carburetors, and machines, then keeps coming back to the same point: pump fuel may look like a customer choice, but Duncan sees it as a variable that can undo a setup. He pushes back on customer certainty pretty hard. The customer is not always right, in his view, when the professional has already said no. That is where warranty comes in. He talks through engines detuned for pump gas, failures that followed, and repairs that behaved once the machine went back on race gas. In his telling, nothing meaningful changed except the fuel. The shop boundary is not subtle. If a rider chooses pump gas after being warned, Duncan says the breakage belongs with that choice. He ties the same idea to small engines too. Chainsaws, weed whackers, blowers, and other small two-strokes are his example of warranties tied to the specified low-lead base fuel. He says shops can tell afterward, which is the practical warning underneath the whole episode: fuel leaves evidence. The end shifts into contact details for appointments, consulting, custom ATV work, racing programs, and event speaking through Duncan Technologies International Inc. The useful part is narrower than the promo, but it lands. For machines built, tuned, or warrantied around race gas, Duncan wants riders to stop treating pump fuel like a harmless swap.

As heard by us

A direct fuel discussion about pump gas, race gas, tuning, and warranty risk.

Leonard Duncan centers the episode on gasoline and the way it shapes ATV, motorcycle, and UTV performance. He draws on work with carburetors, tuning, fuel injection, pump gas, race gas, detuning, and the warranty tradeoff that comes with choosing the cheaper option.

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Why you'd press play

For when you want the race gas versus pump gas argument without the marketing.

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