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Author Topic:   Gas Mileage Report
Clark Roberts posted 04-28-2001 05:34 PM ET (US)   Profile for Clark Roberts   Send Email to Clark Roberts  
Just returned from a cruise (Daytona Beach, Fla to Capitva Island, Fla) .. 320 miles each way and will write up a cruise report soon. Thought I'd drop the mileage figures under this topic so here goes> gas consumption is for the trip over or 320 miles: 24'7" Grady White CC with 250hp(EFI not Hi Press DFI) yamaha used 165 gals (1.9mpg); 23 Whaler Conquest with twin 135 Merc Opti's used 130 gals (2.5mpg); 22 Revenge WT/WD with 225hp Merc Opti used 108 gals (3mpg); my 21 Revenge with 135 Merc Opti used 65 gals (5mpg)... We ran at 30mph whenever possible and had frequent idling, stopping etc.. so these figures are average mileage. The Yamaha and twin 135 Opti's are std. mounting, the single 135 is mounted via a T&H jack plate with 8"setback and the 225 Opti is mounted on a Bob's Machine power jack plate with 6"setback... All swing SS props.. This was a good shake down cruise and long enough to get some good figures.. Happy Whalin'.. The Old Man and the Sea
lhg posted 04-28-2001 11:58 PM ET (US)     Profile for lhg    
As they used to say on Laugh-In "vely in-ta-lesting!".

Two things stand out, Clark. The older Whaler design (Revenge 21), with lesser V, is the most efficient planing hull of them all. And the Merc 135 Opti seems to be one of the very best DFI's. It gets a 2008 emission rating. You've got a winning combination there. A 21' boat that will go over 40mph and get 5 mpg? That's amazing. I used to get that mileage in my much smaller 16' Nauset with a Merc 115.

The figures on the Grady were of interest to me, since it's basically the same length as my 25 Outrage. With Twin Merc EFI 200s, I get the same 1.9 MPG. But my installation, I believe, is more efficient with the bracket and resulting higher engine mounting height.

Your trip sounds like a great Cetacea page. I hope you got some pictures for all of us. I was wondering if Lake Okechobee was even passable through the shallows.

Clark Roberts posted 04-29-2001 07:57 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Larry, the old 21 is, as you say, a very efficient platform and fast! Of course it was the roughest riding of the bunch but we all throttled back in some wavy water in Indian River Lagoon (about 50 miles of the stuff) and the old Revenge made it in fine form... heading accross L. Okechobee we all let it out a bit, like 4 rocket sleds! Water in Lake O is about 6' accross the lake route and the rim canal from Port Myaka to Clewiston is at about 1'.... Rim canal was out. We planned photos on return trip but trailered home due to high winds and so we have no pics.. bad planning.. Back to performance, haven't got exact figures on the 22R or the 24 GW but at WOT my 21 runs 45mph, the 23 CQ runs 47mph, the 24 GW estimate is 45mph, and the 22R estimate is high 40's.. All four boats good runners and best of all all four owners are happy with them! Wish everyone on the forum had been along! Happy Whalin'.. Clark... Spruce Creek Navy.. PS> met some nice folks from Nova Scotia.. check out their website at
Ed Stone posted 05-07-2001 10:13 PM ET (US)     Profile for Ed Stone  Send Email to Ed Stone     
Hey Clark,
Sounds like a fun trip!I have the same power
as the 23 conquest.I believe my props are
17p.I have never left it at Wot to find out
top speed.I've been 42mph but always backed
off in fear of over revving.I've read to
bring the boat up on a plane with one motor
I should carry a prop one size smaller.
We sure have had some strong winds this
past couple of weeks.
This past sunday the manatee people were
taking surveys at the ramp.
Ed Stone
Clark Roberts posted 05-08-2001 07:41 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Ed, the 23 CQ swings 17" pitch Mirage plus (no vent holes) and engines are mounted as low as possible. It turns about 5300 at WOT and runs 47mph per GPS. BYW, it will plane easily and run about 25-30mph on one engine (other tilted out of the water). yours should do the same... hard to believe that a single 135 with that tall a pitch can do that, but it certainly can! We almost got blown away, you are so right about the winds... happy Whalin'
lhg posted 05-08-2001 12:51 PM ET (US)     Profile for lhg    
Clark - on those Miarge Plus props, are they the earlier version without vents, or the newer PVS models and he was simply using the solid vent plugs? Evidently, the Merc prop engineers now think that the Mirage models can benefit from the variable venting system, as this change was made in 1999.
Clark Roberts posted 05-13-2001 12:07 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Larry, they are the Mirage Plus without the vent holes...

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