Probably the biggest, most powerfull thing I have drove was the
Light Armored Vehicle-25 (LAV-25)
Primary function: Provide strategic mobility to reach and engage the threat, tactical mobility for effective use of fire power, fire power to defeat soft and armored targets, battlefield survivability to carry out combat missions.
Length: 251.6 inches (6.39 meters)
Height: 106.0 inches, (101.0 with pintle mount removed) (2.69 meters)
Width: 98.4 inches (turret facing forward) (2.5 meters)
Weight: 24,100 pounds (10,941 kilograms)
Combat Weight: 28,200 pounds (12,802.8 kilograms)
Range: 410 miles (660.1 kilometers)
Speed: 62 mph (99.2 km/hr)
Swim speed: 6 mph (9.6 km/hr)
Crew: Driver, gunner, commander and 6 troops
Armament: M242 25mm chain gun, M240 7.62mm machine gun mounted coaxial to the main gun
Unit Replacement Cost: $900,000
I am trying to find the stats on the horse power, etc.
A funny thing happened in one of these once. We were going to another base for a training exercise one day. Getting there required us to travel on the freeway. Well, some how, the speed governor was removed.

Our caravan was clocked going almost 80 mph in a 65mph zone.