Originally Posted By: UrS4
Stop blaming the winter blend.
The winter blend only contains 2-3 percent less energy!
Blame the cold starts and the increased air drag!
The air drag change is bigger than most might think. I calculated a 12.5 % increase in air density summer to winter which translates directly to increased drag. A motorcycle has a really awful drag coefficient so not surprising I see a big drop in winter MPG. I have over 10 years of MPG records and the plot looks like a sinewave with the regular annual winter dips and summer highs.
Stop blaming the winter blend.
The winter blend only contains 2-3 percent less energy!
Blame the cold starts and the increased air drag!
The air drag change is bigger than most might think. I calculated a 12.5 % increase in air density summer to winter which translates directly to increased drag. A motorcycle has a really awful drag coefficient so not surprising I see a big drop in winter MPG. I have over 10 years of MPG records and the plot looks like a sinewave with the regular annual winter dips and summer highs.
