The Mercury 340 Sport 2007 vs Mercury V-570 2011 comparison sits squarely in the category of decisions where specs alone won't tell the whole story — intended use, storage, and long-term ownership costs all factor in.
Size is the most obvious dividing line here. The Mercury V-570 2011 measures 18,3 feet overall (2011), giving it roughly 7,3 additional feet of deck space compared to the Mercury 340 Sport 2007 at 11,0 feet (2007). Weight tells a clearer story for trailering families: the Mercury V-570 2011 tips the scales at 818 lbs — 695 lbs less than the Mercury 340 Sport 2007 at 123 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.
The power gap is worth calling out. Rated to 135 hp, the Mercury V-570 2011 has a 120-hp advantage over the Mercury 340 Sport 2007's 15-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load.
For family outings this is probably the sharpest distinction between the two. The Mercury V-570 2011 is rated for 15 passengers, while the Mercury 340 Sport 2007 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Mercury V-570 2011 could be the deciding factor.
Bottom line: Choose the Mercury V-570 2011 if your priority is putting more people on the water — it handles 15 passengers and at 18,3 ft it has the deck room to back that rating up comfortably. The Mercury 340 Sport 2007 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.