When I was about 11 I started driving our Ferguson TEA20.... about the same time as I started riding our Honda CT90. I had both drifting before too long.
http://www.motogrrl.com/pix2000/side.jpeg
http://www.motorstown.com/images/ferguson-tea20-06.jpg
It made 20 HP, weighed in at a ton, and had a 8 gallon fuel tank.
I never did try it with the Ford TW25 that I used to plough with in England.
http://images.wikia.com/tractors/ima...-_IMG_1928.jpg
It made about 160 hp, weighed about 7 tons and had a 75 gallon fuel tank that I used to fill in the field with a hand pump in the field. I changed the 5 gallons of oil every 3 or 4 weeks.