Gas Mileage

[Nkybassfisherman]

I've got a 93 Pro Craft 15.5 ft boat with a 93 Mercury 90 HP 2 stroke on it, can anybody roughly estimate what MPG this thing will get at full throttle ?

[07SkeeterZX225]

Most boats I've seen are lucky to get 3-4mpg at WOT. I don't even try to think about what mine gets (Skeeter ZX225 with Yamaha 225HP)

[Way2slow]

I haven't run a small motor in many years but if I had to guess, I would say about 2.5 -2.8 mpg at WOT. If you are concerned about fuel milage, you need to look at a DFI or Four Stroke. However, even with those, no motor is going to get very good milage at WOT, but DFI/4strokes will give the best at midrange speeds. About 3,000 rpm will give the best mileage but 4,500 will do pretty good and get you there with a reasonable amount of speed.

Best way to check it is fill it full, take an extra five gallons, run a known distance of 10 miles or so at WOT and then using the extra five gallons fill it back up again and see how much it takes and do the math. Use a gps if you have one

[Sfritr]

I have a 96 Johnson 150 on the back of my 18ft Stratos. I filled up the tank once (35gal) ran five miles at WOT on the GPS. Filled the tank back up and did the math which almost brought a tear to my eye, a wopping 2.9mpg. Thankfully, most of the lakes I fish are 2000 acres or less.

If you are looking to save gas money with a boat motor, get an extra paddle

[Nkybassfisherman]

Not really looking to save gas money, i just have a tournament and the run i wanna make is 46 miles there and back and my boat only has a 15 gallon tank.

[J Francho]

So you're gonna cut out 3 hours of fishing time to make that run, assuming you can even make it on that tank?

Better be a really good spot. Seems foolish to run that far.

[Grey Wolf]

Have you got an extra 5 gal. gas can thatyou can take along ?

[Fishing Rhino]

Fifteen gallons, if it makes it won't leave much for a safety margin, not to mention what you'll burn when you get there. Unless you will only use the trolling motor when you get to the fishing area. Better bring extra fuel so you don't have an uh oh moment.

[Nkybassfisherman]

So you're gonna cut out 3 hours of fishing time to make that run, assuming you can even make it on that tank?

Better be a really good spot. Seems foolish to run that far.

how do you figure its cutting out 3 hours ? haha? my boat will run almost 50 MPH and its 46 miles there and back. that would be less than an hour of fishing time

[J Francho]

OK, two hours, assuming flat seas, and no boat traffic. Unless you have to stop and gas up frequently. If you get 3 mpg (that's generous), you need about 31 gallons of gas, not including any reserve. And is that 46 nautical miles or 46 miles as the crow flies? I don't think you're considering all the variables. Find a place to buy gas on the lake (I've actually done this for a tournament, and yes I did well, 2nd place), or figure out how to more than double your capacity.

Good luck with the tournament.

[Team_Dougherty]

I've got a 93 Pro Craft 15.5 ft boat with a 93 Mercury 90 HP 2 stroke on it, can anybody roughly estimate what MPG this thing will get at full throttle ?

generally you will burn 10% of horsepower, in gallons, of fuel at WOT. So, 10% of 90HP is 9 gallons an hour at WOT.

[NBR]

I have never checked the mpg's but I read a Boating or Bass and Walleye Boat test of my boat when I first bought it.Low mpg's at low rpm's. At 4500rpm mpg was at 4.5 mpg with a rapid drop off above 4500 rpm. Over the years I have looked at other performance checks and large engine or small they seem to have the best mpg's at about 4500rpm. And a surprise to me they all get about the same mpg's.

This is all based on my maybe suspect memory and subject to challenge.

[South FLA]

Most manufactures have performance bulletins that are listed for their engines, find the boat motor combo that is closest to yours and assume roughly you get that gas mileage.

Here is Mercury:

http://www.mercurymarine.com/engines/engine-tests/outboards/