Jetta Lake Bonneville. Flat out on the Bonneville salt. 1 Jetta drops anchor: brake parachutes help to decelerate from over 300 km/h on the salt flats. 2 The 2.0-litre production engine was the subject of various modifications for the record attempt, including new conrods, pistons, valves, camshaft and a larger turbocharger. The ground clearance was lowered to a minimum and a special tyre reduced roll resistance. The interior of the Jetta was stripped out completely – only the bare essentials were left on board. Fast, faster, Jetta: in April 2018, a modified Volkswagen Jetta earned its place in the Guinness Book of Records. 1 2 1 Golf GTI Performance – WLTP fuel consumption in l/100 km: low 10.1 / medium 7.1 / high 6.3 / very high 7.5 / combined 7.4; CO₂ emissions combined in g/km: 168; efficiency class: D.