2011 Limited - My MPG
Tourer
Joined: Dec 2010
Posts: 250
Likes: 0
From: Mesa arizona
2012 FLHRC here, I'm at about 39.X in cold weather mixed riding (just got it in October), running V&H fishtail slip ons, SE A/C and FL-VIEDS, I'd expect to get a bit better in warm weather.
Moving to Fuelmoto coated X-pipe in the spring will be very curious how that affects mileage.
Moving to Fuelmoto coated X-pipe in the spring will be very curious how that affects mileage.
Seasoned HDF Member
Joined: Sep 2009
Posts: 17,149
Likes: 6,173
From: SE Michigan
http://www.swri.org/10light/mile.htm "With this in mind, hot air is less dense than cold air; therefore, the engine breathes less hot air per revolution and requires less fuel."
And given that cold air is more dense than hot, it makes sense that more fuel is required to get the same AFR at a lower air temp, therefore.
About: http://www.swri.org/6swsa/work/facts.htm
"Southwest Research Institute (SwRI), headquartered in San Antonio, Texas, is one of the oldest and largest independent, nonprofit, applied research and development (R&D) organizations in the United States. Founded in 1947, SwRI provides contract research and development services to industrial and government clients in the United States and abroad. The Institute is governed by a board of directors, which is advised by approximately 100 trustees."
Last edited by Keithhu; Dec 3, 2011 at 02:03 PM.
Road Warrior
Joined: May 2010
Posts: 1,294
Likes: 1
From: South FL
I'm sorry, but that's exactly wrong.
http://www.swri.org/10light/mile.htm "With this in mind, hot air is less dense than cold air; therefore, the engine breathes less hot air per revolution and requires less fuel."
http://www.swri.org/10light/mile.htm "With this in mind, hot air is less dense than cold air; therefore, the engine breathes less hot air per revolution and requires less fuel."
At higher temp (hot air), the engine will have less power than at lower temp (cold air).
The study above is just for car which has a radiator and thermostat to keep the engine at a constant temperature, so it's different than the air-cooled engine.
Road Warrior
Joined: Aug 2010
Posts: 1,268
Likes: 8
From: Detroit, the asshole of America
I'm usually in the 40-41mpg range, but have had some tanks in the mid 30's, and a couple around 45. The bike gets it's best fuel economy under 60mph or so, but I exceed that on the freeways around here all the time.
Extreme HDF Member
Joined: Jun 2007
Posts: 12,653
Likes: 18
From: Broken Arrow, Oklahoma
It's that high *** humidity you have up there in the summer.
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