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If it was possible to ride a 107 in exactly the same way as a stock motor, it is likely you will get similar gas mileage. But when it is all done we don't do that! I have an S&S 107 and mileage is similar to before, but plainly the bike will now accelerate quicker and with ease, as well as climb hills quicker and go faster. All these will use up a little more gas.
Frankly you shouldn't bother yourself about mileage. Get on and do it and enjoy it! Mileage will be OK, believe me.
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Graham
Harley owner since 1974, Founder & Life HOG Member. 1990 Bright Candy HiFi Blue FLHS/2008 S&S V107T, 2007 XB12R, 2003 FXDXT, MG ZT V8.
If it was possible to ride a 107 in exactly the same way as a stock motor, it is likely you will get similar gas mileage. But when it is all done we don't do that! I have an S&S 107 and mileage is similar to before, but plainly the bike will now accelerate quicker and with ease, as well as climb hills quicker and go faster. All these will use up a little more gas.
Frankly you shouldn't bother yourself about mileage. Get on and do it and enjoy it! Mileage will be OK, believe me.
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Lyn in ATL
09 Road Glide HQ 107
I've enclosed several runs from my stock 07 RKC, high cleaner, converted true dual and gets 46 mpg with stock ECU. I've been working on a system that's gets great throttle response, 40mph to 130mph in 4.3 seconds, and as you can see the hp and tq, not to mention the smooth lines during accel. working on a patten so not ready to reveal it. I thought I would share the last dyno result. I want to add no internal parts added just the high flow cleaner and converted from stock to true dual and custom mufflers.
40 to 130 in 4.3 seconds? That gotta be some system. My 09 with A/C, PCV and D&D BOSS Fatcat gets to 130...NEVER.
It does get to 105 in about 33 seconds going downhill though.
