Hi Dave.
I forgot about the us /imp gal which explains the contents , but that was not the main issue .
If you fire up the mosquito at any airport with full tanks , then go to fuel section and empty one of the main tanks of its 171 gal and you will see one of the rear gauges read empty but the gauge is only calibrated from 0 to 59 on the gauge face similarly if you look at the fwd gauges with full tanks it reads full but the dial face says 0 to 146 gal but its only reading the aux tanks fuel of 69 gals .
Because this is in the model which i cannot alter , i have effectivly cheated by making the AUX capacity 171 and the mains 69 to match the gauges , this changed the cg a little so using a temp white nav light , for location purposes , i repositioned the tanks to about the center of the tanks according to a cutaway drawing of the mosquito , this seems to keep the mosquito cg close to where you had it .
I also noticed you had not modeled the fuel tank selectors so i made a provision for two valves in the aircaft.cfg and asigned switches in FSUIPC to select the tanks fwd-aux/ctr/aft-main , i also asigned a switch to transfer fuel fwd while switch held and off when released so fuel can be transfered from aft ctr gauge to fwd-ctr gauge , else fuel does not get used in the rear ctr gauge , if you dont touch any tank selectors then fuel is used from all tanks via default fsx usage order .
I also added an auto pilot for when i am away from controls , not real i know , but better than hitting pause .
i have yet to check the max range against a video i saw , where a pilot who flew mosquitos and a write up i saw indicates the aircraft should have a range of 2040 miles , which if i remember is about 1700 nm aprox , but i need to find out what whights of fuel/bomb and eng settings where used for this max range , as i have only managed about 850 nm with about 12% fuel left .
I do like flying this aircraft , wish i had downloaded it a lot sooner , and i love that vintage looking radio .
regards Alan.