Originally Posted by Alan Priddy
I think the 8.5 is the stretched version of the 7.4 and dont hold me to this but I think they around the 135 litres each. All the stringers and bulheads would be in the same places and we managed to get 3 x 135 under the deck which gave us a 400 NM range. The extra lenght would be for the engines. There is only one way which is to drain them down and then fill them. Alan P
Finally drained the diesel tanks and they are 190 litres per side, maybe I have a different bulkhead configuration.
I needed 8 days of use to almost empty them so I am certainly not displeased. The boat is running perfectly. 3200rpm seems to be the sweet spot for economy. I had to follow a friend for 3 hours in the ocean at 6 knots and it used a lot more per mile.
The digital fuel gauges are not particularly accurate as there only about 8 LEDs, also the first 'half' takes a lot longer to empty, could be because of the shape of the tanks. I may change the gauges to a regular needle type.
Thank you everyone for your input.