Touring Models Road King, Road King Custom, Road King Classic, Road Glide, Street Glide, Electra Glide, Electra Glide Classic, and Electra Glide Ultra Classic bikes.
Sponsored by:
Sponsored by:

Lost a Few MPG

Thread Tools
 
Search this Thread
 
Old May 21, 2009 | 10:38 AM
  #1  
Jerry/MD's Avatar
Jerry/MD
Thread Starter
|
Cruiser
Joined: Oct 2008
Posts: 111
Likes: 0
From: Perry Hall, MD
Default Lost a Few MPG

I know this subject has gotten beatin' to death...but I'm gonna ask anyway.

I've lost about 3-4 mpg since I installed a Stage 1 AC, V&H True Duals with Classic Slip-Ons and downloaded a 'canned' EFI map. Is this normal?
 
Reply
Old May 21, 2009 | 10:43 AM
  #2  
kupitz's Avatar
kupitz
Cruiser
Veteran: Marine Corps
Joined: Aug 2008
Posts: 222
Likes: 53
From: Lancaster, PA
Default

I averaged 38mpg before a SE Stage 1 filter, 2-1 Supertrapps and dynoed for economy....now I get 36mpg.
 
Reply
Old May 21, 2009 | 12:48 PM
  #3  
Jerry/MD's Avatar
Jerry/MD
Thread Starter
|
Cruiser
Joined: Oct 2008
Posts: 111
Likes: 0
From: Perry Hall, MD
Default

Originally Posted by kupitz
I averaged 38mpg before a SE Stage 1 filter, 2-1 Supertrapps and dynoed for economy....now I get 36mpg.
Mine went from 42 mpg to 38 mpg. From reading previous threads on this topic I have seen various results. Some got more mpg...some got less.
 
Reply
Old May 21, 2009 | 12:50 PM
  #4  
sortasuave's Avatar
sortasuave
Tourer
Joined: Jun 2006
Posts: 372
Likes: 0
From: Austin Tx
Default

Most will get less...

Your adding more fuel to the fire to help cool things down. So yes, you will get less mileage. The question is.. How much less are you getting?
 
Reply
Old May 21, 2009 | 12:50 PM
  #5  
oldbagr's Avatar
oldbagr
Road Master
Joined: Aug 2008
Posts: 928
Likes: 0
From: Redmond, WA
Default

Mine dropped several mpgs with the Stage 1 install.
 
Reply
Old May 21, 2009 | 12:57 PM
  #6  
Modee1245's Avatar
Modee1245
Tourer
Joined: Jul 2007
Posts: 328
Likes: 0
From: houston
Default

The true question is, how is your bike running... Better or worst or the same...

If its better then loosing a few mpg is worth it.
 
Reply
Old May 21, 2009 | 12:59 PM
  #7  
VTwin-Goodies's Avatar
VTwin-Goodies
Former Sponsor
Joined: Nov 2007
Posts: 47,839
Likes: 1,956
From: SoCal
Default

This is true as the new combo of air filter and pipes will suck a little more gas then with the stock setup. It's really due to the air filter.
 
Reply
Old May 21, 2009 | 01:02 PM
  #8  
Buzzsaw's Avatar
Buzzsaw
Road Captain
Joined: Nov 2007
Posts: 544
Likes: 0
From: MD
Default

When I got the bike, I had the SE/AC, stock pipes and Stage 1 download. I was getting 36-38 mpg most types of riding.

I know have Jackpots' and a PCIII Dyno Tuned and am doing between 39-44 depending on how loaded up and the roads I am doing.

I seem to be doing better with a tweaked map than I was with the Stage 1 download.
 
Reply
HD Forum Stories

The Best of Harley-Davidson for Lifelong Riders

story-0

7 Times Harley-Davidson Chucked Tradition Out the Window

 Verdad Gallardo
story-1

7 Surprising Harley-Davidson Products that Are Not Motorcycles

 Verdad Gallardo
story-2

8 Best Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-3

10 Worst Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-4

Killer Custom's Jail Break Is The Breakout That Refused to Blend In

 Verdad Gallardo
story-5

Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

 Verdad Gallardo
story-6

Harley-Davidson Reveals Super Cool Cafe Racer Concept

 Verdad Gallardo
story-7

Engraved Rebellion: Inside Bundnerbike's Glam Rock II

 Verdad Gallardo
story-8

10 Motorcycles You Should Never Buy

 Joe Kucinski
story-9

10 Things Harley-Davidson Needs to Fix in 2026

 Verdad Gallardo
Old May 21, 2009 | 01:04 PM
  #9  
Jerry/MD's Avatar
Jerry/MD
Thread Starter
|
Cruiser
Joined: Oct 2008
Posts: 111
Likes: 0
From: Perry Hall, MD
Default

Originally Posted by Modee1245
The true question is, how is your bike running... Better or worst or the same...

If its better then loosing a few mpg is worth it.
Bike runs fine. Definately got a pop in performance, especially in acceleration. Just wanted to verify my mpg results make sense. Sounds like they do.
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
KCFLHRC
Touring Models
38
Sep 29, 2010 05:07 PM
eglinski
Touring Models
2
Feb 10, 2010 12:01 PM
TexasVet
Touring Models
6
May 28, 2008 07:33 AM
ACRoadKing
Ignition/Tuner/ECM/Fuel Injection
2
Aug 24, 2006 11:22 AM
ACRoadKing
Ignition/Tuner/ECM/Fuel Injection
4
Aug 24, 2006 12:22 AM




All times are GMT -5. The time now is 05:49 PM.

story-0
7 Times Harley-Davidson Chucked Tradition Out the Window

Slideshow: Harley-Davidson built its reputation on nostalgia, but every so often, the company took a hard left turn into the future.

By Verdad Gallardo | 2026-05-20 11:18:19


VIEW MORE
story-1
7 Surprising Harley-Davidson Products that Are Not Motorcycles

Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.

By Verdad Gallardo | 2026-04-29 16:50:35


VIEW MORE
story-2
8 Best Harley-Davidson Motorcycles Ever

Slideshow: Not every Harley gets it right, but these are the ones that genuinely earned their reputation.

By Pouria Savadkouei | 2026-04-15 14:23:21


VIEW MORE
story-3
10 Worst Harley-Davidson Motorcycles Ever

Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.

By Pouria Savadkouei | 2026-04-01 20:01:09


VIEW MORE
story-4
Killer Custom's Jail Break Is The Breakout That Refused to Blend In

Slideshow: Killer Custom's "Jail Breaker" build focuses more on stance and visual aggression than mechanical overhaul.

By Verdad Gallardo | 2026-03-18 19:20:32


VIEW MORE
story-5
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.

By Verdad Gallardo | 2026-03-07 16:15:30


VIEW MORE
story-6
Harley-Davidson Reveals Super Cool Cafe Racer Concept

Slideshow: Harley-Davidson's new RMCR concept revives the café racer formula with modern hardware-and it may be exactly the reset the company needs.

By Verdad Gallardo | 2026-03-04 12:23:37


VIEW MORE
story-7
Engraved Rebellion: Inside Bundnerbike's Glam Rock II

Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.

By Verdad Gallardo | 2026-02-24 18:19:44


VIEW MORE
story-8
10 Motorcycles You Should Never Buy

Slideshow: There is no shortage of great motorcycles to buy, but we would avoid these ten.

By Joe Kucinski | 2026-02-19 14:50:51


VIEW MORE
story-9
10 Things Harley-Davidson Needs to Fix in 2026

Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.

By Verdad Gallardo | 2026-01-13 18:33:17


VIEW MORE