I'm starting to get a picture here.
102,800 pounds empty sounds like a passenger 727-200. The freighters all weighed in around 91500 to ~94000 empty. A max weight of 210,000 pounds was also available only on passenger airplanes iirc, and those had to be the "super" 727's with the JT8D-217 or -219 (MD-80 motors) in positions 1 and 3. Fuel of 60,149 would normally only be available with an aux tank, not a big deal, but most freighters if they had an aux tank had them removed because it cut in to usable lower cargo space, and normally affected what your max zfw could be (interestingly I left the fs9 727 with about the same fuel amount).
With all that being said these are the stats/weights that I published with the FS9 version of the airplane (and these weights came from an actual 727-200F with JT8D-17's that I flew):
Engines: Pratt & Whitney JT8D-17
TO Thrust: 16,000 lbs x 3
Max Taxi: 195,500 lbs
MaxTOW: 194,800 lbs
MLW: 161,000 lbs
ZFW: 152,000 lbs
OEW: 94,300 lbs
This yields an available payload of 57,700 pounds. In my real world 727 flying we would almost never get to max payload, because we would bulk out the airplane first (physically run out of space). The only time we would come close was at Christmas time, when the US Mail was shipping very full containers, then it wasn't unusual to be running around with minimum fuel for most of the trips, and we would sometimes have to leave mail behind if the weather necessitated more fuel.
With the above numbers, if you load it up to max you can only take 43,500 pounds of fuel off of the ramp. Keep in mind that the 727 is a short to medium range freighter and if you're going to fly a long distance you can't take a whole lot of freight with you. It's the same old issue as most ga piston airplanes have, you can fill the seats or fill the tanks but not both.
I'm curious what the turbine engine section of the aircraft.cfg says on the FSX bird....here is the FS9 version (and I got the static thrust number from the guy that did the fde, he was nice enough to publish what the FS9 value should be for the different engine variants available on the 727):
[TurbineEngineData]
fuel_flow_gain=0.0010
inlet_area=8.9462
rated_N2_rpm=12250.000
static_thrust=15200.00 // This is set to Max continuous thrust, NOT max Thrust, DO NOT ADJUST.
afterburner_available=0
reverser_available=1
bypass_ratio=1.07
I tend to agree with you though that we are having a weight issue with the FSX airplane, and we may have a powerplant issue too as far as fuel burn is concerned.
EHAM-YSSY B772LR