FP3 mileage change - Harley Davidson Street Forum - Street 500 and 750
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post #1 of 11 Old 07-29-2017, 10:34 AM Thread Starter
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FP3 mileage change

I changed to a SE nightstick with 2 extra discs, a K&N air filter and added an FP3 to get the mixture right. I used the V&H CO/ high flow AC map and ran a tank full through the bike. The mileage dropped from my usual 62mpg to 51mpg. Auto tuning now and don't know what to expect.

Gear box management was difficult in 4-5-6 because I couldn't hear the engine. It's still tough to hear above 65, but the Nightstick/extra discs is a good compromise. I also wanted the FP3 to take advantage of the non-ethanol 92 octane fuel. The ability to add/remove diffuser discs is a big advantage for the Nightstick.

I'll know the results after this weekend.

Mileage during auto tune (140 miles) was 63.48 mpg. Surprised me, I expected worse. 3000' elevation in our area.
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Last edited by ButterSmooth; 07-29-2017 at 05:52 PM. Reason: add another point
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post #2 of 11 Old 10-01-2017, 10:11 AM
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Just saw this post of yours. I have a similar combination except for the additional discs. Mine is what came with the SE slip ons. Is there any advantage in removing all the discs in terms of power or is there only more noise. I am quite happy with the current sound. Incidentally I have auto tuned mine and get between 21 and 22 km to a litre of gas. Over here it’s in km and litres so you will have to do your math to convert.
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post #3 of 11 Old 10-01-2017, 11:26 AM Thread Starter
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I added discs to get the sound level up just a bit so I could hear the engine through my full face helmet. Super Trappp says 10 discs is the same as an open end cap for performance and sound. I added 4 discs first, but that was too loud and seemed to reduce low end torque. It may have increased top end performance, but I rarely ride wide open and the sound was an irritant all the time. Super Trapp details all of the potential cap and disc changes you can make on their site. SuperTrapp - Making Waves of Sound, Style, Power

It's been 3000 Miles (4828 km) since my auto tune and over those miles my 500 has averaged 66 mpg (28Km/L) on 92 octane fuel. I live in wide open country, so traffic is never a factor in mileage. I love the long winding roads, with only an occasional stop. A good site for fuel consumption conversion is http://www.thecalculatorsite.com/con...onsumption.php.
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post #4 of 11 Old 10-01-2017, 01:57 PM
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Where I live we can only get Ethanol 10% in all grades. My 750 has the VO2 Intake, Firebrand GP muffler. FP3 Stock Map. Usually get around 58 Mpg on Premium 92-93 Octane. RM Method. I also have some extra weight. Luggage rack, Bags, Windshield. And carry Tools, Tire pump, First Aid kit. Charging cables for my GPS and Phone. Both Mini and Micro USB.

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post #5 of 11 Old 10-01-2017, 06:54 PM Thread Starter
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Bet those charging cables really slow you down.... (sorry, couldn't resist)

Tucsonmax1, you should try the auto tune. My mileage went up substantially, but that may be because I'm at 3000'.
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post #6 of 11 Old 10-02-2017, 05:07 AM
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You are right since I am on auto tune I just topped my tank from the earlier full refill and it barely took in 2 litres which with current cost and the kms that I ran gave me an average of 29km to a litre which is pretty great for a Harley. I had a Royal Enfield 350cc Bullet before this and it used to give me an average of about 40. Also Buttersmooth appreciate the information on Super Trapp.
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post #7 of 11 Old 10-02-2017, 10:15 AM
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Incidentally any ideas for a fuel guage. My 2016 model has only a reserve warning indicator and it does not have a real time guage. There was one product by Dakota through J&P Cycles but the technical consultant informed me that lot of rewiring will have to be done and therefore I shelved it. Is there any such guage which can be installed easily without recourse to major wiring. I will be grateful for the information.
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post #8 of 11 Old 10-02-2017, 11:14 AM Thread Starter
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I've never been concerned about a fuel gauge. I use my 'B' trip odometer, resetting it when I fill the tank. The bike goes at least 180 miles to the light and at least 210 to empty and that informs me well enough. You could tee into the fuel line at the front of the tank and put a clear tube up along the steering head and mark graduations along the tube. The tube should be capped, with a tiny air hole at the highest point. But, that's not really any more information than using the trip odometer.
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post #9 of 11 Old 10-03-2017, 10:51 AM
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Thanks Buttersmooth. The trip meter option is there but I was thinking of a regular fuel gauge.
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post #10 of 11 Old 10-03-2017, 05:44 PM
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I went 197 Miles on 3.4G gasoline


I did notice that when it gets colder out, The Mpg's drop. And that 10% Ethanol doesn't help

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