Fuelly's EPA Estimates are Based Upon Old EPA Estimates - Fuelly Forums

Click here to see important news regarding the aCar App

Reply
 
Thread Tools Display Modes
 
Old 09-04-2008, 02:41 AM   #1
Junior Member
 
Join Date: Sep 2008
Posts: 3
Country: United States
Location: Randallstown, MD
Fuelly's EPA Estimates are Based Upon Old EPA Estimates

Can Fuelly's Database be updated with the new EPA estimates from the updated testing procedures instead of old EPA estimates specifically for 2007 model vehicles?

The EPA changes in testing began in 2008. However, the EPA computed the new EPA estimates for 2007 models. The revised EPA numbers would be more relevant in comparing ones mpgs with that of the EPAs.

Check it out at
http://www.fueleconomy.gov/feg/ratings2008.shtml

For example:
2007 Saturn Vue Hybrid
Old EPA Estimates 27 City 32 Highway 29 Combined
New EPA Estimates 23 City 29 Highway 26 Combined

2007 Saturn Vue FWD Auto 4cvl
Old EPA Estimates 22 City 27 Highway 24 Combined
New EPA Estimates 19 City 21 Highway 25 Combined
__________________

SaturnHybridVue is offline   Reply With Quote
Old 09-04-2008, 02:44 AM   #2
pb
Senior Member
 
Join Date: Jul 2008
Posts: 1,588
Country: United States
Location: Corvallis, OR
Unfortunately, the only EPA estimates we have access to are those estimates made available by the EPA for download, located here. Once the EPA makes the new estimates available in a format we can use, we'll update them here.
__________________

pb is offline   Reply With Quote
Old 09-04-2008, 03:02 AM   #3
pb
Senior Member
 
Join Date: Jul 2008
Posts: 1,588
Country: United States
Location: Corvallis, OR
Or if there's some formula we can apply to the old numbers to get them closer to the new estimates we could to that too. The EPA has an estimate update calculator on the site that's independent from specific models, but we have no way of knowing how they're arriving at the new numbers.
pb is offline   Reply With Quote
Old 09-04-2008, 05:09 AM   #4
Junior Member
 
Join Date: Sep 2008
Posts: 3
Country: United States
Location: Randallstown, MD
As far as I know it varies via make and model. It would be hard to input all the numbers.
SaturnHybridVue is offline   Reply With Quote
Old 09-04-2008, 02:37 PM   #5
Junior Member
 
Join Date: Aug 2008
Posts: 2
Country: United States
Location: Sacramento, CA
I'd like to see the newer EPA estimates as well, since they seem to be more realistic.

It looks like the formula is in the source code for the calculator page: https://www.fueleconomy.gov/feg/calculator.html

Check out the function calculateMpg
ObliteRon is offline   Reply With Quote
Old 09-05-2008, 12:32 AM   #6
pb
Senior Member
 
Join Date: Jul 2008
Posts: 1,588
Country: United States
Location: Corvallis, OR
Thanks for pointing that out ObliteRon, looks like we could use their formula. I'll do some tests and see how far off the calculation is from the actual per model new numbers.
pb is offline   Reply With Quote
Old 10-03-2008, 03:39 AM   #7
pb
Senior Member
 
Join Date: Jul 2008
Posts: 1,588
Country: United States
Location: Corvallis, OR
This came up today in another thread, but I'll update here. It looks like we can calculate the new city and highway numbers with the math in the calculateMpg function. But I can't get from those new numbers to the new Combined estimate.

In the example from today, the new MPG estimates are 12 city, 16 highway, and 13 combined. I'm not sure how they get to 13 combined—it's not simply adding the two numbers and dividing by 2. And even the unrounded totals from calculateMpg don't give a combined value of 13. I can't find the method the EPA uses to calculate combined MPG anywhere. Frustrating.
__________________

pb is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Fuelly iOS Apps
Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 02:17 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.