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Old 01-19-2012, 12:26 PM   #9 (permalink)
sendler
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Join Date: May 2011
Location: Syracuse, NY USA
Posts: 2,935

Honda CBR250R FI Single - '11 Honda CBR250R
90 day: 105.14 mpg (US)

2001 Honda Insight stick - '01 Honda Insight manual
90 day: 60.68 mpg (US)

2009 Honda Fit auto - '09 Honda Fit Auto
90 day: 38.51 mpg (US)

PCX153 - '13 Honda PCX150
90 day: 104.48 mpg (US)

2015 Yamaha R3 - '15 Yamaha R3
90 day: 80.94 mpg (US)

Ninja650 - '19 Kawasaki Ninja 650
90 day: 72.57 mpg (US)
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Quote:
Originally Posted by TedV View Post
I’ve heard folks talk about different fuel maps programed into different bikes. If that is the case then there are many BSFC maps depending on tune, so no easy button on this one.
Changing the fuel map is only one aspect fuel efficiency and wouldn't be the major one assuming the maps are around 14.7 to begin with. I think cam timing and gas flow rates/ pulse tuning are the major considerations. Much of which is fixed in the engine design. Along with heat loss from too much combustion chamber area from an engine that is unnecessarily large in displacement. Which also runs at higher intake vacuum due to having too much peak power for the job.
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