I just picked a random Four Winns model and looked at the "fast facts" pamphlet for it.
2011 SL262, 320HP VP 5.7 GXI/DP
Fuel consumption:
Code:
RPM MPH GPH
2000rpm 9 5
2500rpm 13 7
3000rpm 23 9
3500rpm 30 11
4000rpm 34 13
4500rpm 39 19
WOT 45 24
2011 SL262, 375 HP VP 8.1 GI/DP
Fuel Consumption:
Code:
RPM MPH GPH
2000rpm 11 7
2500rpm 20 9
3000rpm 29 12
3500rpm 36 16
4000rpm 43 20
4500rpm 49 25
WOT 51 29
So, as you can see, I was wrong indeed. That's with a lighter boat though. There is a negligible advantage of fuel economy the 350 has over the 496, but as you get faster, the gap narrows, and by the time you're just overtaking the 350 powered version, you're burning the same if not slightly less fuel than the small block. The telling difference is the faster top end, if that's what you want.
On a small lake, if all you're doing is putting around with a few people and minimal gear, get the small block. If you like to take several people out and wakeboard/tube all day, then there's no replacement for displacement. I'd imagine that as you load the boat with the 5.7 down, at some point the big block will get better all-around fuel economy.
Let's see what a heavier boat does...
2011 V285, 320 HP VP 5.7 GXI/DP
Code:
RPM MPH GPH
2000rpm 8 6
2500rpm 11 8
3000rpm 24 11
3500rpm 31 14
4000rpm 35 17
4500rpm 38 20
WOT 42 24
2011 V285, 375HP VP 8.1GI/DP
Code:
RPM MPH GPH
2000rpm 9 7
2500rpm 13 10
3000rpm 30 12
3500rpm 35 16
4000rpm 40 21
4500rpm 44 26
WOT 45 30
Notice something interesting here? The 350 drinks 17 gallons per hour at 35MPH, while the 496 drinks only 16 gallons per hour at the same speed.
Hope this helps
