Bill and Gary want to smash the record of getting Ruby to be the highest car ever on the Pico De Orizaba, Mexico’s highest mountain standing at more than 4,260 metres. This volcano has a fearsome reputation as a killer peak – not everyone who goes up this mountain comes down. Landslides, 300-metre sheer drops, ash and forests line the route, but the biggest danger is the extreme altitude they will face on the climb – literally sapping Bill and Gary of their strength. When Ruby gets stuck in a deep gully, the boys must use the roof rack as an anchor to pull her free. In amazing feats of Bill Wu ingenuity Ruby climbs a tree, gets winched sideways out of a forest and finally, strips naked to her bare engine to make the final, agonising ascent.