well... I never jump in my engine room, i walk in thru the door... come and think of it, I woudlnt' want a boat where i need to lift saloon hatches to get in the ER, a door is much more conveninent!
Bruce is right, Trawler is for the most part a marketing word... and how about those "fast trawlers" or "Swift Trawlers"... makes no sense!
slow down below hull speed and most diesel boats will be reasonably efficient, although not as economical as a true displacement hull. On my 53 I get about 1 NMPG at 9kts, if i slow down by a knot, i cut down fuel burn to 6 or 7gph. If i try to push at 10kts, it jumps up to 13gph... or 30% more fuel for 10% more speed...
as bruce said, engine size is doens't affect fuel burn that much, speed does.
what i love about the 53, beside the hatteras built quality, is the flush deck design with the HUGE aft deck, saloon and lower helm all on the same level as the side decks. No steps... The aft deck is where we spend the most time... and even in summer, there is a lot of ventilation thanks to the side doors, windows and aft deck doors which means we dont 'need to run the air during the day.
Mine has naturals, so it will not get up on plane... those with Turbos can get on plane (just) and hold a 17kts cruise when needed. that's nice to have ...