Fuel mileage sucks!
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Cruiser
Joined: Mar 2009
Posts: 122
Likes: 0
From: League City,TX
Fuel mileage sucks!
I know there are many threads with bad fuel mileage subjects but thought I'd try again. I have an '09 with a SERT, SE air cleaner and V&H Shortshots and from day ONE, I have averaged no better than 35mpg. However, that is almost all around town. I have been out on the interstate and taken some long trips but never gotten more than 45 mpg. I've had it on the dyno THREE times, once after break-in, once at the 10K service and again about six months ago and still the same. It runs like a scalded dog so I've learned to live with it. It's just that it's sort of a bummer when other Dyna folks I speak to tell me they get almost 50 mpg! I'm looking for gas almost always between the 120-130 mile mark. That's just retarded! I have read many posts claiming the Shortshots are the culprit but that sure seems like a huge loss in MPG to attribute to the exhaust. Any one have an opinion. Thanks in advance.
Road Captain
Joined: Jul 2009
Posts: 636
Likes: 1
only time I get around 50 is back and forth to work, thats on the freeway off the freeway,around town average 42, stock pipes with slipon, and upgrade K&N filter, no tuner just the xieds,thats running very easy not getting on it at all.if i jump on it im down around your figures,only run around 65 to 70 on the freeway above that milage drops
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Cruiser
Joined: Mar 2009
Posts: 122
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From: League City,TX
I looked at the Dyno charts (before/after) tis last time and really tightened things up; AFR is good throught the entire range, HP and torque improved from stock. Oh well, didn't buy it for the fuel economy 
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Outstanding HDF Member
Joined: Aug 2011
Posts: 2,325
Likes: 7
From: SE Illinois
I have gotten 47-50 pretty consistently since break in.
I have stage 1 breather, V&H 3" slips-ons & dyno tuned with SEPST at break in. I had my tuner tune it for performance also & told him to forget about fuel economy & I still get good mileage out of it & runs awesome.
Having Wood TW-222 cams installed and dyno tuned again as we speak, so I imagine my mileage will suffer, but that's ok.
I have stage 1 breather, V&H 3" slips-ons & dyno tuned with SEPST at break in. I had my tuner tune it for performance also & told him to forget about fuel economy & I still get good mileage out of it & runs awesome.
Having Wood TW-222 cams installed and dyno tuned again as we speak, so I imagine my mileage will suffer, but that's ok.
Cruiser
Joined: Apr 2012
Posts: 149
Likes: 0
From: ct
I have always gotten no more then 35 on my fxdx. But I beat the crap out of it every time I'm on it. If I rode it like I didn't steal it would be better lol.
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Outstanding HDF Member
Joined: Feb 2006
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From: West Tennessee
Best tank I've had was 56mpg but that was riding around on two lane back roads with an old fart that never goes over 60mph. If I do a lot of riding in town I may get as little as 35mpg but my average is around 40mpg. Riding style has a huge impact and I always run the **** out of mine.
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Thread Starter
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Cruiser
Joined: Mar 2009
Posts: 122
Likes: 0
From: League City,TX
