According to
Cirrus, the useful load for the base model with full tanks is 282kg
A fully IFR equipped TB20 has 500kg payload, minus 240kg full fuel = 260kg cockpit payload.
Full TKS is about 50kg, a turbo (TB21) another 50kg, very roughly, so you are down to a 2-seater, but a very mission capable one: full de-ice and FL250 ceiling.
The Malibu will carry 4 and bags at up to FL250 and over 1200nm at 220kts TAS. I did Paris to Guernsey on Saturday in 50mins. Thats on a 350hp engine derated to 310hp and doing 17GPH LOP
What is the usable fuel volume?