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After Big Bore, how's you MPG?

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Old 07-19-2019, 12:33 PM
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Default After Big Bore, how's you MPG?
Hey to all, Ok blast away!! I know I'll get; Who cares...Not why I did it... etc. So here is the question, You had a 107/114, you wanted more power/torque for riding two up or just plain cruising. With that in mind did your mileage stay the same, drop or increase? Alrighty, let the fun begin although this is a serious question, I would really like to know. thanks, CSM-H
 
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Old 07-19-2019, 03:31 PM
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On my 2019 Road king 107 I was averaging 42 to 43 mpg Stock. After the FM124 Kit I am now averaging 38 to 39mpg. So I only lost about 4mpg -- a very reasonable trade off considering the power increase.
 
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Old 07-19-2019, 03:44 PM
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Originally Posted by hdrider1
On my 2019 Road king 107 I was averaging 42 to 43 mpg Stock. After the FM124 Kit I am now averaging 38 to 39mpg. So I only lost about 4mpg -- a very reasonable trade off considering the power increase.
This is my nearly identical result as well with my 120 kit.
 
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Old 07-19-2019, 04:28 PM
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hdrider1 and strych9, that's the info I am looking for. I average about 8-9K a year not a lot, but not bad and I like getting reasonable mileage while I am doing it. thanks, CSM-H
 
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Old 07-19-2019, 08:04 PM
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Got to pay to play.

air + fuel = Power
 
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Old 07-19-2019, 08:17 PM
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Mine dropped about 20 or thirty cents per tank not enough to worry about
 
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Old 07-19-2019, 09:51 PM
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are you guys maintaining the same speeds to get the 40 mpg? only way I can get 40-42 on stock bike is steady throttle and keeping rpms below 3k. . But CA gas sucks for mileage, I get better in Utah, east
 
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Old 07-19-2019, 10:16 PM
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Originally Posted by hog95023
are you guys maintaining the same speeds to get the 40 mpg? only way I can get 40-42 on stock bike is steady throttle and keeping rpms below 3k. . But CA gas sucks for mileage, I get better in Utah, east
I use 93 octane with 10% ethanol here in Ohio - available most everywhere here. On the Stock 107, mileage started at around 38-39 mpg when new and increased to 42-43 mpg as I reached around 2,000 mi. I do brisk takeoffs, but rarely if ever rev to redline and normally cruise at 75mph on the freeway. Generally only use full throttle for passing.

After the FM124 kit I drive the same way -- mpg continued to increase from 32-35mpg and leveled off at 38-39mpg once I got to around 3,000mi.
 
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Old 07-20-2019, 07:54 PM
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42 MPG to 35 MPG is less than $200 for 10,000 miles at $4 a gallon . I save a enormously more buying Hanes Beefy T's instead of the outrageously over priced Harley T's. LOL
They gave me 2 cards for 2 free T shirt worth $30 each when I bought my bike. It cost me $25 for 2 free T's for the wife (which were small size).
 
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Old 08-09-2019, 08:26 AM
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Originally Posted by rdc401
Mine dropped about 20 or thirty cents per tank not enough to worry about
I've seen your dyno graph man you got value plus right there dude !

Peace.
 
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