triple vs twin on gas consumption ?
 

OK ! I know!

Triple are sometimes more expensive to insure and not as easy to sell, triple maintenance...

But, I'M mixed between a formula 419 triple 500' running (not sure) between 75 and 80 mph I guess, and a 42 sonic twin 500's running I guess 65 mph.

cruising speed at 3500 in the sonic must be around 40 mph

cruising at 3500 in the formula must be around ... 50mph?

My question is: from point A to point B, at cruising speed, I'M I right thinking the triple would not be really more expensive to run than the twins? Full throttle I'm sure it would be more thursty, but at cruising speed???

or more simple question, how many miles a gallons does a sonic and a F419?

really?your buying a boat based on fuel economy,,,,,too funny

Triple is less than most People think,with the three everything is working less.

not really, unless triple are a pig on gas. I have nothing financed but sometimes I try not to throw money for next to nothing more. if it's one third more gas for the small difference in speed, it's not Worth it for me...

It is NOT a third more,more like 15 percent.

I thought I read a 525 uses 54 gallons per hour at wot. If a 500 is close to that, I guess 35 gallons an hour at cruise. Three motors working together I assume might lower that number a bit. Maybe 28 gallons times 3?? I have no idea, but as much ground as I cover on a weekend I know I wouldn't want the fuel bill.

Every motor will have a given consumption rate at any RPM whether it is in a single,twin, triple or quad configuration. What changes is the "cruise" MPH @3600 RPM (example) and with the additional power, top end! It really is a "catch 22"

It would be very interesting to see hard numbers of an actual burn rate/ performance #'s on a similar bigger I/O boat rigged with twins and trips.

Similarly, I know of a few 32 Skaters over the years that had Trip where the owners pulled the center motor. They couldn't really justify feeding the extra motor, hammering the center gearcase/failures for the few extra MPH on the topend when they primarily used the boat midrange with the odd top end run.

It does take more RPM/fuel to run these boats at a given cruise w/twins vs trips.

Test run both boats, the twins may feel that there is enough power and gives you what you are looking for in a comfortable cruise the way it's set up or just feel like a dawg compared to the trips....

You should find one of the Hustlers or Nortechs with the triple Yanmars you can cruise at 50 all day long getting double the MPG you will get with any gas boat. A lot less maintenance also.

The 426 Skater V is a sweet boat with the twin oil burners - performance, longevity and 1500 mile cruise range. You would only have to fill it up once per season - LOL.

Surprised it took so long to find a home..unless it was because it had no cabin?

In theory SORTA but not completely true, lets talk fuel injection-Your fuel tables that control injector PW are MAP/rpm based and we all know it takes X # of lbs of fuel to make X horsepower. A boat with twins lets say at 60mph turns 4000 rpms at 90 map, lets say the PW at 4k/90 map is 10 ms per revolution so injector is open 2000 times for 10 ms every minute -20,000, for sake of discussion lets say that equals 100 gallons per hr of fuel x 2 motors=200 gph. Now lets say the same boat has triples, IT cruises at 60 mph at 3600 because there is less load per motor but it has 1 size bigger props, even if with the bigger props it was loaded to 90 map in fuel table at 3600 lets say PW at 90 map map is 9.5 MS and because its only turning 3600 its only , injector 1800 times a minute. 1800X 9.5 MS= 17100 vs 20,000 , 14.5% less fuel per motor. So lets go back to our pie in the sky number of 100 gph at 20,000 injector pw, 17100 is 14.5% LESS. so that would equate to 85.5 gph x3 =256 gph vs 200, yes the triple use more and will never match the fuel use of the twin but we are talking only 22% more because each motor is using only 85.5% as much as they would in the twin application. Now I just sorta put these numbers together, no, neither one will use 100 gph but percentage wise it should help you understand that motors DON'T necessarily use a set amount of fuel to goo a set rpm. Lets take it a step further and say you propped the 2 boats identical so they even turned the same rpm's, the triple would be loafing along at same rpm BUT would fall into a lower map table, probably between 70 and 80 map, the pw would be closer to 9 MS vs 10 and that would equate to 10% less fuel per motor so again you would be using 90 gph vs 100 gph per motor, so 270 gph vs 200 but still not 50% more, only 35% more, I hope this gives you a better idea, Smitty