The Mercury 310 Sport 2008 vs Mercury 340 Air Deck Gray (PVC) 2006 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 340 Air Deck Gray (PVC) 2006 measures 11,0 feet overall (2006), giving it roughly 10,0 additional feet of deck space compared to the Mercury 310 Sport 2008 at 1,0 feet (2008). Weight tells a clearer story for trailering families: the Mercury 310 Sport 2008 tips the scales at 114 lbs — 105 lbs more than the Mercury 340 Air Deck Gray (PVC) 2006 at 9 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.

Both boats share a closely matched power ceiling — 15 hp for the Mercury 310 Sport 2008 and 15 hp for the Mercury 340 Air Deck Gray (PVC) 2006. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup.

For family outings this is probably the sharpest distinction between the two. The Mercury 340 Air Deck Gray (PVC) 2006 is rated for 5 passengers, while the Mercury 310 Sport 2008 caps at 4. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Mercury 340 Air Deck Gray (PVC) 2006 could be the deciding factor.

At this size, power-to-weight ratio matters more than outright horsepower. The Mercury 340 Air Deck Gray (PVC) 2006 comes in at 1 lbs per hp versus 8 lbs per hp for the Mercury 310 Sport 2008. The lower the ratio the more explosive the acceleration — meaningful on a short RIB where bursts of speed, quick planing, and agility in surf or tight waterways define the experience.