Sorry but I still have to respectfully disagree. I think you could absolutely run WOT 24/7 on gasoline if you built the engine right. Like I said before it's all about well matched parts and a reasonable state of tune. A reasonable state of tune on any continuous duty motor is far more conservative than on something like a car and maybe that's where the disagreement is coming from. If you look at the motor on a semi it's huge, all the parts are big, and the hp is relatively low for the size of the motor. The radiator and intercooler are giant and that all contributes to the reliability.
Again, before I said it takes a good tune and matched parts, a typical car can't run WOT for long no matter what kind of engine it has or fuel it uses because they're not designed for continuous duty. You can only keep it going so long as you keep it in balance, and not rotating assembly dynamic balance but energy balance. Again, maybe that's where we're missing each other. Most of the energy released from the fuel in an internal combustion engine is heat and that heat will destroy the motor no matter what the fuel. So to run steady at a certain power level you will need to reject all the excess heat and you need parts that are sized to do that. Car's can't do it because a car making 300hp doesn't have enough radiator or intercooler or oil cooling etc to reject 300hp's worth of heat.
You can get away with high specific power levels in partial duty stuff like a car because you can absorb a lot of that heat for a short period of time without adverse affect the reject it when you're 'off duty' again. So I absolutely agree that held at WOT a car engine will destroy itself but that applies to more than just turbo gas motors, NA, gas, diesel, turbo diesel, propane whatever, they're all the same because they don't have the supporting subsystems designed for continuous duty. You should never ever see 20 minutes WOT in a car so they aren't equipped to deal with it.
Fuel type still doesn't matter though. Also make no mistake that diesels can somehow run WOT forever either because they can't unless they're designed for it. Diesel pickups will absolutly melt down if run too hard for too long. The chipped out trucks will melt in a hurry if run hard for very long because the EGTs will get right up there into the danger zone. It's not real likely with a stock one because they're designed to survive the usage a pickup is likely to see and the same goes for turbo gas cars. I don't think there's anything about gasoline that would make it impossible to run in a continuous duty application. Certainly not being spark ignited because just about every stationary engine/compressor combo with an internal combustion motor out in the oil patch will be a turbocharged, spark ignited, and run on natural gas WOT all day every day. There is no reason a spark ignited, turbocharged gasoline engine couldn't be built to be as reliable as any other, even in the most severe of heavy duty applications which is continuous duty industrial use.
I looked for just such a motor but couldn't find one, but I think that has more to do with diesel simply being a more suitable fuel for heavy duty applications because heavy duty motors have heavy parts and those heavy parts exert huge forces and can only rev so high before they come apart. Diesel burns nice and slow and makes good power at low RPMs so it's a good combo. NG is as close as you'll probably get to gasoline in heavy duty industrial applications because most of the time then engine is running a compressor that's pumping the stuff to the supply line so it's easiest and most cost effective to just take some of that to fuel the motor.
What it all comes down to though is there's nothing inherently unreliable about turbocharging or gasoline fueled engines or turbocharged gas engines.
