Your question is soooo imprecise - define 'quickest' please. superb-velocity, acceleration, quickest-lap of a given song, quickest a million/4 mile drag-strip overall performance? common, changed, racing, or objective-outfitted one-off to break a given checklist? no longer sufficient techniques there, sorry. Oh, and regardless of the undeniable fact that the Ariel Atom with the V8 engine is geared to pull 'purely' approximately 175mph, it rather is going to out-enhance up and out-nook and out-brake in simple terms approximately each little thing obtainable collectively as doing so. AND the ridiculous Veyron is beset with the difficulty of RAMPANT gasoline-intake, because of the fact of it rather is LUDICROUS weight. it rather is been specific that the gasoline-tanks empty in below 12 minutes while the vehicle is being pushed speedy - so after purely some 50 miles or so, you're able to ought to pull in to an quite genuinely-located petrol station, go out the vehicle, pump one hundred forty litres of gasoline, pay for it, come back into the vehicle, enhance up back as much as velocity, and 12 minutes later, do this each and anyone returned! meanwhile, something as mundane as a slippery Audi with a rapid-diesel engine can take care of a plenty larger conventional velocity, pulling some hundred miles of variety from its' tank. Tortoise and the Hare myth, throughout returned. Veyrons are grotesque, fat, heavy, and that they suck. And an Ultima GTR is plenty quicker around the excellent-kit try-song.