aonther MPG question
Road Warrior
Joined: Nov 2005
Posts: 1,484
Likes: 82
From: Mountain View, California
Keep in mind that mileage is worse around town, it's worse if you're heavy on the throttle, it's worse if you're carrying a heavy load, and it's worse if your tires are under inflated. I'm not sure if windscreens make MPG worse or better. I could see it going either way.
Outstanding HDF Member
Joined: Jun 2005
Posts: 3,238
Likes: 0
From: Desmoines, Iowa
better the octane but i would still have it check. i have a p.c. 3 slip on's and air and cams and i'm still getting in the high 40's.some times it's better to find a good indy shop for your dial in . it seem's like at the dealer it a two or three trip deal and it should'nt be .
Tourer
Joined: Aug 2008
Posts: 314
Likes: 0
From: Southern New Hampshire
Dyno tuners also tweak the timing advance curve to get every ounce of power out of your bike. This is all worth keeping in mind, but if your mileage sucks a lot worse that you think it should, I'd advise that you look into it.
Keep in mind that mileage is worse around town, it's worse if you're heavy on the throttle, it's worse if you're carrying a heavy load, and it's worse if your tires are under inflated. I'm not sure if windscreens make MPG worse or better. I could see it going either way.
Keep in mind that mileage is worse around town, it's worse if you're heavy on the throttle, it's worse if you're carrying a heavy load, and it's worse if your tires are under inflated. I'm not sure if windscreens make MPG worse or better. I could see it going either way.
I would think a good windscreen on a Harley would make the mileage worse. It's a big mostly flat shield ... it's not streamline like the fairing on a sport bike.
Tourer
Joined: Oct 2007
Posts: 335
Likes: 0
It's been a long while since I last posted but though I contribute my $0.02.
I'm running a reliable 42-46 MPG on my hot-rodded '04. I generally get about 2 MPG less when riding 2-up. This is calculated across several thousand miles this summer with a 95", SE-251, 100+ HP engine build. I generally run 91-93 non-ox gas. I've also worked extensively on the engine tune and am running a bit on the rich side to keep the tq up and temp down.
I wouldn't have suspected this good of mileage when I did my build, but again, doing the math over 3000 miles of fills during the past couple of months, these are the numbers I'm getting.
I'm running a reliable 42-46 MPG on my hot-rodded '04. I generally get about 2 MPG less when riding 2-up. This is calculated across several thousand miles this summer with a 95", SE-251, 100+ HP engine build. I generally run 91-93 non-ox gas. I've also worked extensively on the engine tune and am running a bit on the rich side to keep the tq up and temp down.
I wouldn't have suspected this good of mileage when I did my build, but again, doing the math over 3000 miles of fills during the past couple of months, these are the numbers I'm getting.
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Cruiser
Joined: May 2008
Posts: 218
Likes: 0
From: Detroit-ish
oh yeah, it is black as pitch inside the ends of my pipes, oh and I forgot to mention when I down shift it shoots flames about 2 feet long, often enough that I have to clean the carbon off the top pipe from the bottom pipe, I have a apt on Monday for a re-dyno
Road Captain
Joined: Jun 2007
Posts: 662
Likes: 0
From: SE Michigan
When my bike was STOCK: 30-32MPG
After Thunder Max & Big Sucker & Rush Slip-ons: 30MPG (street and highway)
I've seen these posts before and NOBODY ever has ANY suggestions on WHAT to CHECK?
Anybody know what would cause this ?
I get the same crappy milage.... would love to just get it to a reasonable level
like 36-38mpg.... I understand if I want great gas milage then I should buy a scooter,
but my gas milage should be close to other similar bikes, there should not be a 10+ mpg
difference on the SAME Year bike....
After Thunder Max & Big Sucker & Rush Slip-ons: 30MPG (street and highway)
I've seen these posts before and NOBODY ever has ANY suggestions on WHAT to CHECK?
Anybody know what would cause this ?
I get the same crappy milage.... would love to just get it to a reasonable level
like 36-38mpg.... I understand if I want great gas milage then I should buy a scooter,
but my gas milage should be close to other similar bikes, there should not be a 10+ mpg
difference on the SAME Year bike....
Things to look at.
Spark Plugs, do they look black when you pull them. Check them both.
Is your Big Sucker all plugged up or does it seem clean?
Exhaust pipes are the all black inside? Wipe the inside with your finger.
Have a dyno RUN done. I see $25 specials. It shows the fuel air ratio over the different RPM's. That will tell you something.
If all the checks out it must be a severe problem in the right wrist area.
Good luck.
PS 45+ on my scoot 99 fxd , stage 1.
Tourer
Joined: Aug 2007
Posts: 413
Likes: 10
From: South Dakota
I am getting 46 mpg on my 02 Lowrider on the highway doing 70-75. It is stock except for cycle shack slipons. Checked it twice this summer and was the same both times.
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Road Captain
Joined: May 2008
Posts: 523
Likes: 0
From: Owasso, OK
