Since Nor-Tech is terrible with their marketing/ providing specs on their boats, I wanted to see how big several things were on our 390. I used a flow meter for a garden hose

Fresh Water Tank: 20.4 gallons (very disapointing)
Transom Walk Through Live Well: 21 gallons
Port/ Starboard Fish Boxes: 50 gallons each
Port/ Starboard Front Seat Coolers: 32 gallons each
Fridgid Ridgid Cooler: 20 gallons
Toilet: 10 gallons

But a sweet fuel supply!

Agree, 310 gallons is a good amount for a 39. Although, I do wish we went with the extra optional 100 gallons ha.

BTW, the 390 now has "only" 285 gallons. Im guessing its due to the stupid new EPA tanks that require more expansion room.