1986 silvertron 34. Fuel consumption

[Riverguy89]

How far can a 1986 silvertron 34 with 270 crusaders (350chevys) cruse on 250 gallon of fuel?

[rslifkin]

If you keep your speed down to 6 - 6.5 kts, I'd expect you'll get between 1.5 and 2 nautical miles per gallon. Get it up on plane and I'd figure 0.7 - 0.8 nautical miles per gallon. With 250 gallons of fuel on board, I'd figure on using about 180 for planning and leaving the other 70 as reserve.

[jphillips]

I have a 1978 31' Silverton with Crusader 270's (SBC350) repowered 2 years back. At 6-8 knots I get 1 NMPG per gallon. On plane try and hit the sweet spot where only the primaries are open vs all four barrels sucking fuel. (Rochester 4MV carbs) If your engines and carb are tuned, boat properly trimmed, bottom clean, and your not loaded down too much you may get .75 NMPG at best! I found in mild chop 2800 RPMs works for me. The 34' is a little heavier and 50 more gallons fuel but your number should be close.