View Single Post
Old 12-13-2007, 03:29 PM   #1 (permalink)
MetroMPG
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,126

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 53.67 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 73.57 mpg (US)
Thanks: 2,917
Thanked 5,764 Times in 2,981 Posts
Equivalent MPG of cycling - garage feature?

The plan from the start has been to add a Garage feature for cyclists. There are 2 approaches we could take (or both, I guess)
  • A simple comparison, showing the proportion of biking vs. driving
  • Peakster suggested factoring bike (or any hpv) distance travelled in a way that gives "combined" MPG with your car(s). EG. if you got 40 MPG last month in your car, and covered 100 miles, but you also rode 100 miles commuting by bike, your total transportation FE for the month is 80 MPG.
  • Another approach is if your bike computer calculates/estimates energy output, you could just do the math and figure out equivalent FE like I did with the ForkenSwift "MPGe".
How do you figure MPGe for a bike, someone helpfully asks?

Quote:
I was trying to figure how to come up with a MPG equivalent for the bike, like you did for the ForkenSwift. I have a power meter that gives me the following data:

kJ
ave watts
time
distance
miles
Ave speed
The MPGe formula would simply be distance (mi) / gallons equivalent.

Here's a conversion site that will give you the US gallon equivalent of gasoline in kJ (and lots of other conversions): http://www.onlineconversion.com/energy.htm

1 kilojoule = 0.000,007,589,6 gallon [U.S.] of automotive gasoline

So if you rode 100 miles and the computer said you used 11,300 kJ then your MPGe is...

100 miles/ (11,300 kJ * 0.000,007,589,6 kJ/gal)

or 100 miles / 0.08576248 GALe

= 1166 MPGe

__________________
Latest mods test: 15 mods = 15% MPG improvement: A-B test, 2007 Honda Civic 1.8L, 5-speed
Ecodriving test:
Manual vs. automatic transmission MPG showdown: Nissan Micra 1.6L



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote