Ernest'
I was playing with one of our performance computers a few weeks ago & on an ISA Standard Day (OAT +15c & QNH of 1013.25Mb) a 235 seat config'd B757 can lift 27 tonnes of fuel + a full pax load. 27,000 Kgs of fuel in a fully loaded B757 will take you about 6 - 6h 30mins. flying time with the standard legal reserves. That could get you to Jeddah, Cape Verde or Bangor, Maine from BLK.
The reason why a B757 can lift stuff off a runway that a B737NG can't is in the braking capability. A B757 has 8 brake units where as a B737NG has 4. I once stopped a B757 within 4800' at CYHM on their runway 24.