gas mileage
#22
12-17-2012, 03:25 PM
Road Master
Join Date: Aug 2012
Location: Surprise, AZ
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Bone stock bike. Took it on a 300 mile run yesterday & averaged 34 mpg. I guess filling up every 140 miles or so is better than filling up every 90. Wish I was getting what some of you guys are! I'd love to get 45 mpg.
#23
12-17-2012, 04:19 PM
Like someone else mentioned, they mix the gas differently in the winter months and it does have a negative effect on MPG. If you are getting 40 mpg on a Street Glide you are doing good anyway. My 09 Street Glide in stock configuration would barely get 40 mpg. With my 107 build i'm lucky to get 35.
#24
12-18-2012, 01:48 AM
Stellar HDF Member
Summer blend Gasoline contains 114,500 BTU's per Gallon and Gasoline with 10% Ethanol contains 111,836 BTU's per Gallon. This means that a 10% Ethanol Blend contains 97.7% of the energy that Summer Blend Gasoline does. Even assuming that the increase in Octane that Ethanol delivers doesn't allow the Computer to run more spark advance (which will increase fuel economy); the reduction in fuel economy when running an Ethanol blend of 10% is minimal. Roughly 1 MPG. The chart below shows the effect that an Ethanol blend of 10% has on Fuel Economy vs Summer blend Gasoline. I suspect that most "street wisdom" regarding this subject is based more on pseudoscience (ignorance) than actual facts.
In 28,000 miles my Heritage has averaged 41.8 MPG. The biggest impact on the bike was the 103 kit and the cams which reduced the fuel economy from an average of 43.5 MPG over the first 13,000 miles to what it is today. I can't say as I notice (A$$ometer) any difference between Summer and Winter Gasoline blends.
In 28,000 miles my Heritage has averaged 41.8 MPG. The biggest impact on the bike was the 103 kit and the cams which reduced the fuel economy from an average of 43.5 MPG over the first 13,000 miles to what it is today. I can't say as I notice (A$$ometer) any difference between Summer and Winter Gasoline blends.
Last edited by Bluehighways; 12-18-2012 at 01:58 AM.
#25
12-18-2012, 08:45 AM
Grand HDF Member
#26
12-18-2012, 09:33 AM
Summer blend Gasoline contains 114,500 BTU's per Gallon and Gasoline with 10% Ethanol contains 111,836 BTU's per Gallon. This means that a 10% Ethanol Blend contains 97.7% of the energy that Summer Blend Gasoline does. Even assuming that the increase in Octane that Ethanol delivers doesn't allow the Computer to run more spark advance (which will increase fuel economy); the reduction in fuel economy when running an Ethanol blend of 10% is minimal. Roughly 1 MPG. The chart below shows the effect that an Ethanol blend of 10% has on Fuel Economy vs Summer blend Gasoline. I suspect that most "street wisdom" regarding this subject is based more on pseudoscience (ignorance) than actual facts.
In 28,000 miles my Heritage has averaged 41.8 MPG. The biggest impact on the bike was the 103 kit and the cams which reduced the fuel economy from an average of 43.5 MPG over the first 13,000 miles to what it is today. I can't say as I notice (A$$ometer) any difference between Summer and Winter Gasoline blends.
In 28,000 miles my Heritage has averaged 41.8 MPG. The biggest impact on the bike was the 103 kit and the cams which reduced the fuel economy from an average of 43.5 MPG over the first 13,000 miles to what it is today. I can't say as I notice (A$$ometer) any difference between Summer and Winter Gasoline blends.
#27
12-18-2012, 05:56 PM
In winter the air is colder and therefore more dense. You'll need octane levels at least 91, maybe 93 if you can find it. I never run Ethanol so no experience with it.
A couple months ago we had a thread going here regarding octane. In the summer at high elevations you only need 89 octane, anything higher is a detriment to power and MPG.
So the winter conditions ought to be reversed.
A couple months ago we had a thread going here regarding octane. In the summer at high elevations you only need 89 octane, anything higher is a detriment to power and MPG.
So the winter conditions ought to be reversed.
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