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Granfort 300 GTS Boat: A Masterpiece of Design, Performance, and Luxury GRANFORT 300 GTS 📞 +1 (800) GRANFORT Book Sea Trial Granfort 300 GTS · Single Inboard · 2026 300 GTS Single Mercruiser 6.2L V8 · 350 HP · 30 ft Inboard Sport Cruiser · 38 mph top speed 38mph Top speed · 6 persons · GPS 350hp Mercruiser 6.2L V8 9.7gph Cruise burn · 3,000 RPM 103mi Autonomy at cruise Scroll 38mphTop speed · GPS · 6 persons 350hpSingle Mercruiser V8 inboard 30ftLOA · 9.10 m · sport cruiser 9.7gphCruise fuel burn · 3,000 RPM 103miAutonomy at cruise speed The 300 GTS — correctly understood A single inboard. A different character entirely. The Granfort 300 GTS is powered by a single Mercruiser 6.2L V8 350HP DTS inboard engine — not outboards. This is a fundamentally different boat from the 300 GTX, which uses twin outboards. The inboard drivetrain gives the GTS a distinct feel: lower centre of gravity, cleaner hull lines below the waterline, and the deep, purposeful sound of a V8 at full throttle. At 9.10m LOA on a 2.80m beam, the 300 GTS is built for buyers who want the engaged, connected feel of an inboard sport cruiser at 30 feet — with a cockpit designed for entertaining and a cabin below for weekend stays. The performance data on this page comes directly from Fibrafort’s published factory test (Test FK 300 GT #014) — conducted on Rio Itajaí-açu, Itajaí/SC, Brazil, with speed measured by GPS. Real numbers. Named source. No marketing estimates. The ownership experience Social cockpit. Weekend cabin. V8 inboard soul. The 300 GTS is designed for buyers who want a sport cruiser that is genuinely alive at the helm — not just a platform for passengers. The cockpit is social. The cabin is comfortable. And the Mercruiser V8 reminds you why inboards exist. Social cockpit Designed for real entertaining · aft-to-helm flow Premium finish Fibrafort construction · 35+ years expertise On the water 38 mph top speed · GPS confirmed 38 38.0 mph top speed — 6 persons aboard, GPS measured Achieved at 5,300 RPM with 6 persons aboard at 50% fuel and 100% water. With 12 persons aboard the boat still reaches 37.4 mph at 5,300 RPM — a testament to the hull efficiency at all load levels. Source: Fibrafort factory test FK 300 GT #014. Factory test · GPS · 6 persons 15.9 15.91 seconds to plane — 6 persons From rest to fully on plane in under 16 seconds with 6 people aboard. With 12 persons the planing time rises to 21.53 seconds. Minimum planing speed: 27.0 mph with 6 persons, 25.45 mph with 12. Single inboard drivetrain creates a distinct, engaged transition onto plane. Published factory test 350 350 HP — Mercruiser 6.2L V8 DTS · single inboard 261 kW. V-8 6.2L displacement. 5,000–5,400 RPM maximum. Three-bladed stainless steel P19 propeller. Inboard drivetrain — not outboards. The V8 delivers a character and acoustic signature that twin outboard configurations fundamentally cannot replicate. Mercruiser 6.2L V8 DTS 103 103 nautical miles autonomy at cruise — based on 100% tank At 3,000 RPM cruise (10.0 mph / 8.6 knots), fuel burn is ~36.7 L/h (~9.7 GPH), giving 103 nautical miles of range on 380L (100 gal) tank. Extend that to a 3,500 RPM cruise (11.7 mph) and range reaches 158 nautical miles — the most efficient point on the consumption curve. 380L tank · 100% capacity Published fuel and autonomy data Real consumption numbers. Factory test. Named source. All data below is from Fibrafort’s published performance test FK 300 GT #014, conducted on Rio Itajaí-açu, Itajaí/SC, Brazil. Fuel consumption measured via engine instruments. Autonomy calculated at 100% tank capacity (380 litres). 6-person test shown. RPM Speed (knots) Speed (mph) Consumption (L/h) Consumption (GPH) Miles per Litre Autonomy (miles) Best use 3,000 8.6 10.0 36.7 L/h 9.7 GPH 0.27 103 mi Fuel economy cruise 3,500 10.1 11.7 49.6 L/h 13.1 GPH 0.23 158 mi ⭐ Best range point 4,000 13.3 15.3 67.2 L/h 17.7 GPH 0.23 145 mi Performance cruise 4,500 26.5 30.6 73.3 L/h 19.4 GPH 0.42 126 mi Sport cruise (planing) 5,000 31.0 35.7 93.8 L/h 24.8 GPH 0.38 127 mi Fast cruise 5,300 33.0 38.0 114.6 L/h 30.3 GPH 0.33 126 mi Top speed run Source: Fibrafort Performance Test FK 300 GT #014 — Mercruiser 6.2L 350HP DTS · P19 propeller · 6 persons · 50% fuel · 100% water · Rio Itajaí-açu, Itajaí/SC, Brazil. Speed by GPS. Autonomy based on 100% tank (380L). GPH converted from L/h (÷ 3.785). What the data tells you: The most efficient cruising point is 3,500 RPM — 11.7 mph at 13.1 GPH giving 158 miles of range. The “sweet spot” for range on the 300 GTS is a comfortable harbour-to-harbour cruise speed. When you want performance, 4,500 RPM puts you planing at 30.6 mph on 19.4 GPH. Top speed of 38 mph at 5,300 RPM consumes 30.3 GPH — reserve that for the runs that deserve it. See every angle The 300 GTS on the water. Cockpit Bow deck Interior On the water Granfort 300 GTS — in motion Single Mercruiser V8 · 38 mph · Inboard sport cruiser Complete specifications — published factory data Every number. Named source. All specifications from Fibrafort’s published performance test FK 300 GT #014 and the Granfort 300 GTS product brochure. Hull & Dimensions LOA9.10 m (29.8 ft) Beam2.80 m (9.2 ft) Draft minimum0.40 m (15.7 in) Draft maximum0.53 m (20.9 in) Transom deadrise15° Hull weight (no engine)2,980 kg (~6,570 lb) Total weight · 6 persons~4,274 kg (~9,420 lb) Total weight · 12 persons~5,126 kg (~11,300 lb) Engine & Drivetrain EngineMercruiser 6.2L V8 TypeInboard · single engine Power350 HP (261 kW) Displacement6.2L · V-8 cylinder Maximum RPM5,000–5,400 DTS systemDigital Throttle & Shift PropellerP19 · 3-blade stainless steel Engine weight508 kg (1,120 lb) Capacity & Storage Fuel capacity380 L (100 US gal) Water capacity55 L (14.5 US gal) Passenger capacity12 persons (day) Overnight capacityCabin with berth Equipment weight (std)364