General Discussion Anything SuperHawk Related

shitty gas mileage!

Old 10-26-2008, 06:37 PM
  #1  
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shitty gas mileage!

I'm averaging 35mpg over the first 3 tanks. Damn. And I haven't been on it that hard.
What can you get if you baby it?

stock.
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Old 10-26-2008, 06:49 PM
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Originally Posted by MLB View Post
I'm averaging 35mpg over the first 3 tanks. Damn. And I haven't been on it that hard.
What can you get if you baby it?

stock.
37
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Old 10-26-2008, 06:53 PM
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low 40's highway tucked drafting 65... why bother?
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Old 10-26-2008, 06:59 PM
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i lucked up one time and got 45mpg on a tank. I must have been a fluke. or my math was off.
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Old 10-26-2008, 07:01 PM
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That's normal for the two largest carburetors that Honda ever put on a bike.
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Old 10-26-2008, 07:10 PM
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Originally Posted by sumthin_major View Post
i lucked up one time and got 45mpg on a tank. I must have been a fluke. or my math was off.
You must have been going downhill too??
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Old 10-26-2008, 07:17 PM
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I've gotten 47 mpg cruising at a steady 70 mph, but for short trip - around town riding I get about 36.
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Old 10-26-2008, 07:28 PM
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Combination of stop and go and freeway=40. Canyon carving=mid to high 30's.
If you're looking for mileage, get an EX250.
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Old 10-26-2008, 07:39 PM
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41-43 with steady riding for me.
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Old 10-26-2008, 09:25 PM
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Mid-40's putting around (following the wife through the mountains of NC). Normally about 35-38 riding her hard as usual.
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Old 10-26-2008, 09:32 PM
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Riding the bike or the wife hard? Should be fun either way.
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Old 10-26-2008, 10:01 PM
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With a proper tune the best I have done is 41 while leading a small group, but usually 37-38. When I first got the bike I was getting 31-34. It was jetted for a K&N but I had a stock filter.
Don't feel bad, several members have reported mid 20's!
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Old 10-27-2008, 06:25 PM
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Actually 35 mpg is pretty typical for a sport bike of any kind, in my experience.
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Old 10-27-2008, 06:27 PM
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Hardley's get 50mpg. Worth converting?






NAAAHHH!
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Old 10-27-2008, 07:02 PM
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Originally Posted by Hotbrakes View Post
Hardley's get 50mpg. Worth converting?






NAAAHHH!



i'll stick to my superhawk!
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Old 10-27-2008, 07:59 PM
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33 or so and less if I run hard, going back to the stock jetting or lower (am at 180/178 I think OE is 178/175) but keeping needles shimmed .040" and OE filter and 2Bros slip-ons. Gone back to the OE sprockets (was 43 in the rear) and still no better mpg but find it needs to run in 5th as it seems to want to lug at less than 65 mph in top gear. Going to do a wet & dry comp test and maybe vacuum leak down. Wonder if I have reverse blow-by with 60k miles on the clock but always have had crappy milage (though had the 43 rear since maybe 23k when I changed out the chain). Have a spare set of carbs I may try. Still runs pretty good with no detontation on 87 octane (except under heavy load at real hi ambient temps) but have not had it on a dyno for many moons when it was putting out about 101 hp & 68 ft lbs on a Dynojet 250.

What do you think Greg? Is it just the nature of the beast I got; i.e., some run good but suck gas and others more frugal? Its bake date is 3/97.
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Old 10-27-2008, 08:20 PM
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My old GSXR750 gets mid 40's, the Hawk gets 30-36 riding her on the pipe.
She gets 38-40 gurgling along with a group.
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Old 10-27-2008, 08:32 PM
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When I bought my hawk, I was 32-35. Then I got new exhaust gaskets, adjusted the idle down from 2k to 800 rpm, and ran some Sea Foam through a tank of gas, since it had sat some in the preveous year. After all that I get low 40's and I tested a tank on hard riding and got 39.7 mpg getting on it most of the time. So I think 40's is very capable if everything is running right.
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Old 10-27-2008, 10:20 PM
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34 if I go easy; as low as 26 if I'm on it-----what's the big deal?
Horsepower eats gas.......and Man!!! Does she run sweet..........Drink deep, baby....
~'98 Uberhawk~47k mi.
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Old 10-28-2008, 12:02 AM
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Gas mileage and Superhawk do not belong in the same sentence. I got my indoctrination early with one of the forum adminstrators. We're going to meet for breakfast. Breakfast was great.

After breakfast we take a spirited ride out 963 and the RLOD comes on just as we get to 183. We're 18 miles north of Seward Junction so I think to myself no sweat - all the reading that I've done on the forum I got 30 or so miles to empty. I can make it to the Junction no prob. We say our gb's and we're off. Remember Briggs Texas, it's like one of those horror movies. Last chance for gas, shitty food, don't blink and BTW last chance for gas! Blew through there like rock stars in a limo and ended up 3.5 miles short of the Junction. The bike died just as I was passing a concrete mixer. I gotta hand it to that driver as we were both trying to figure out what the **** was going on. I was passing him and then he was running over me.

It got worse. So bad that when I lifted the tank I was getting 77 miles to the light. So I pull the tank (one of my favorite maintenance maneuvers) expecting to find a dirty K&N. Not - dirty stock filter.

The PO had the bike jetted to accomo the new TBR high mounts but the shop failed to replace the air filter. ???

Obviously somebody did not have all their ponies behind one fence. I put a new K&N in the bike and tested last weekend. Huge difference. The bike is - huge difference. Did I say that? Huge difference. The bike is smoother and doesn't pound (detonation) like it did. It's maybe still a little rich but it pulls like a sled-dog all the way up. The idle is better, the run off choke while warming is smoother/better/not puking rich. As I'm rounding the corner to get back up to the shop the light comes on. 102.5 miles. That's right at 30 mpg. That's twice as good as my truck and I will leave it at that.

Last edited by nuhawk; 10-28-2008 at 12:22 AM.
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Old 10-28-2008, 06:45 AM
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A tad over 30 with K&N, Jet kit, slip-ons.
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Old 10-28-2008, 07:55 AM
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I typically get between 41-43mpg commuting and 38ish in the twisties.
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Old 10-28-2008, 09:47 AM
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35-57mpg

I average about 35 too, but this is around town driving. I went on a 300 mile trip and during that trip it got 57mpg on one tank 53 on another and 47 on the last tank but i did use the rest of the fuel that was in it after the trip around town.
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Old 10-28-2008, 10:45 AM
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If you change sprockets size, I know the speedometer reading is off. but what about the odometer? Does it still report the right mileage? Can I trust it when I calculate mpg?
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Old 10-28-2008, 10:48 AM
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No, they are both run of the same signal... So the error is about the same on them, usually with a small difference (stock speedo error)...
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Old 10-28-2008, 11:00 AM
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Thanks Tweety. That kinda suck. I'm forced to buy a speedohealer now. I don't want the ODO to show one day 20K miles when I only rode the bike for 15K.


Hmmm that also means that I probably don't get more than 70-80 miles out of a tank. But yeah, I ride her hard most of the time.
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Old 10-28-2008, 04:17 PM
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42 just driving around....30 when playing around
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Old 10-28-2008, 04:59 PM
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Anywhere from 42-47. Typically 44mpg with my weekly commute.
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Old 10-28-2008, 06:30 PM
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Originally Posted by Tweety View Post
No, they are both run of the same signal... So the error is about the same on them, usually with a small difference (stock speedo error)...
If that is the case, then when I had on the 43T rear, it was actually getting less milage than it calculated out? If so, my mpg was lower than I thought and now that I have a 41T back on, am I actually geting better mpg, allbeit the same as I THOUGHT I was getting but was not? My brain is too tired to figure it out myself now.
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Old 10-28-2008, 07:00 PM
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I'm used to twins being economical!

No big deal, but it does run out fast!
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