|
|
|
|
|
|
|
SUBJECT: # 27116: Fuel Consumption and MPG
Submitted by RickK (204.108.8.5) from VIRGINIA on 3/4/05 5:07:00 AM
All these new "high tech" outboards have me mighty confused. Now, how many times have the old salts here on the board said that a carbuerated outboard will guzzle 10% of its horsepower at WOT. What this means is a 225 hp engine will consume approximately 22.5 gallons per hour. Note that further down this page someone talks about 10% at WOT for one of the new injected engines.
One of the FIRST things I do when I get a new boat is determine the fuel consumption and MPG of my boat so I can predict range and fuel burn. Sound reasonable? (I still record the gas usage and MPG for all my family's vehicles because the benefit is I can tell when something isn't working properly somewhere in the car's engine.)
I've had the same boat for 5 years now. and here's the stats for my boat, a 1995, 2140 Robablo (4700 pound) with a 225 Mercury Offshore: On a flat calm day at 3900-4000 rpm I get around 1.75 miles per gallon. On a crappy day where I'm busting through 3-4 footers and jiggling the throttle I get about 1.5 miles per gallon.
From what I've read on numerous web sites and manufacturer's sites the ACTUAL consumption of my carbed Offshore is about the same as a fuel injected engine.
Yeah my engine is a pig, not clean burning at all, but where are the TREMENDOUS savings in fuel effifiency?
RickK
- 3/4/05 10:22:00 AM
Submitted by
Roby (205.188.117.7) from TEXAS says Throttle body
Throttle body injected engines are no more fuel efficient that carbed models. They just start easier. Your increase in fuel mileage comes from direct injected motors such as the Ficht, HPDI, Optimax, E-Tech etc..........
- 3/4/05 1:08:00 PM
Submitted by
Dunk79 (68.44.136.169) from NEW JERSEY says Also...
Roby is right, but should have continued on to say that DFI, EFI and carbed engine all burn the same amount of fuel at WOT. EFI's beat carbs up to about 1500rpms, but over that they are about the same. DFI's are 30-40% better than EFI/Carb until you get over 5000rpms. Over 5000 they all know right where the fuel tank is...
