Practical max capacity
From Cantr II Wiki
This means base capacity minus 60000g for a character to drive, 180g for a vehicle lock , 10g for a key. Motorcycles also have 1160g for a motorcycle engine deducted, while cars and all other motorized vehicles have 2080g for a car engine (A) decucted. This means that if you have the car engine (B) instead, you have a further 580g less than this value. (or a full 2660g less if you have both engines).