Commercial propane weighs about 3.696 lbs per gallon. So a 25 lb tank would be around 6.764 gallons.
Your upper leg muscles or in other words your thighs.The upper thigh muscled called the Quadriceps or Quads. Quads straighten legs, glutes/hamstrings straighten the hips, erectors/abs hold the back straight, and calves straighten the foot. All are involved in the squat.