Quick totals (may still contain errors), per month
Financing 460,500.00
Annual Maint. 18,420.00
Salaries
Pilot 6,000.00
Astrogator 5,000.00
Chief Engineer 4,400.00
2 Engineers 8,000.00
Medic 2,000.00
Chief Gunner 1,100.00
3 Gunners 3,000.00
Troop Leader 550.00 (Sergeant, per Bk 4)
7 Troops 2,100.00 (Privates, per Bk 4)
Life Support (Assumes provisions included)
Single Occupancy (6 total SR) 24,000.00
Double Occupancy (6 total ST) 48,000.00
Ammunition (12 reloads per year total?) 20,000.00
Cr 20,000 per missile, call it 1 per month
Fuel = 3 full tanks per year. Totals
No Jump, Refined 20,000.00, total 623,070.00/month
No Jump, Unrefined 4,000.00, total 607,070.00/month
Skim all fuel (Unrefined, skimmed) 0.00, total 603,070.00/month
Every jump-3 is basically going to cost you a months worth of normal operation. At a bare minimum, not including troop equipment, etc, I get MCr 7.24 if you skim all your fuel. That doesn't include maintenace on the G-carrier, ship's boat, or troop equipment. Also doesn't include berthing fees, software, etc, and I assumed provisions (food) were included in the LS costs. An 'exciting' system would drive the price up quite a bit due to missile reloads and repairs. Offhand, I'd say spend some money, buy a fuel purifier, and skim everything - it will pay for itself in no time. If you've got the cash and can buy it outright, that brings the monthly cost down to Cr. 162,570 per month.
Just taking a rough SWAG at it, it looks like it costs about 3% of the purchase price to operate it per year. I don't know if that would hold true for other ships, though. That's well below TCS's 10% rate, leaving about 7% of the ships maintenance cost for bases, repairs, etc. If it's bought outright, it's about MCr 2 per year to run, which is .88% of the purchase price.