2010 Prius Photos - 102 of them!

[jprates]

Originally Posted by ken1784

Sorry to be late...

Ken@Japan

No problem Ken, thanks a lot.

[ken1784]

Originally Posted by jprates

No problem Ken, thanks a lot.

I believe the KEY is "6th: raw data".

Ken@Japan

[jprates]

Originally Posted by ken1784

I believe the KEY is "6th: raw data".

Ken@Japan

Indeed. I was wondering what the test cycles were to reach this data.
It seems no one asked Akihiko Otsuka about it, or surely they would have stepped in to this thread already.

Could it be Japanese test-cycles? Maybe not, perhaps in the Japanese test cycles the MPG would actually be even better.

The fact that the city driving gets better than road driving gets me lost.
What do you think of it Ken?

[JSH]

Originally Posted by jprates

Indeed. I was wondering what the test cycles were to reach this data.

<SNIP>

The fact that the city driving gets better than road driving gets me lost.
What do you think of it Ken?

I expect that these are numbers from the US specific testing. The current Prius records higher fuel economy on the City cycle than the Highway cycle for US testing.

Here is some information on US CAFE testing:

CAFE Testing

CAFE fuel economy testing is done over the same laboratory test that is used to measure exhaust emissions (FTP-75). CAFE certification is typically done based on fuel economy data provided by the manufacturers. In some cases, the EPA performs the testing in its laboratory in Ann Arbor, MI.

The CAFE fuel economy figures can be significantly different from the vehicle fuel economy data published by the EPA/DOE in the Fuel Economy Guide report and on new vehicle labels. There are three sets of fuel economy figures:

• EPA’s unadjusted dynamometer values,
• EPA’s adjusted on-road values, and
• NHTSA’s CAFE values.

The unadjusted EPA values are calculated based on CO2 emissions measured over the dynamometer test, using a carbon balance equation. The EPA on-road fuel economy values provided to consumers on new vehicle labels, in the EPA/DOE Fuel Economy Guide, and in EPA’s Green Vehicle Guide are adjusted downward by 15%, to make the data more representative of the real world driving conditions.

The CAFE values—used to determine manufacturers’ compliance with the average fuel economy standards—are significantly higher than the EPA on-road values. The CAFE data reported by the DOT is not adjusted by the 15% factor used by the EPA.

Here is the FTP-75 Test Cycle:

This information is from: Emission Standards: USA: Cars Fuel Economy
Diesel net has emission standards and test cycles for all the major standards in the world.

[ken1784]

I believe the raw data test was done by US EPA test cycles.
Fuel Economy Test Schedules

Ken@Japan

[ken1784]

Originally Posted by jprates

The fact that the city driving gets better than road driving gets me lost.
What do you think of it Ken?

Unlike a conventional vehicle, the THS/HSD vehicles are basically better on EPA city MPG than highway.

Ken@Japan

[jprates]

Originally Posted by ken1784

Unlike a conventional vehicle, the THS/HSD vehicles are basically better on EPA city MPG than highway.

That's precisely what got me lost.

I knew European test cycles were out of the equation because we have worse performance in city driving (makes more sense to me as well) than at extra urban driving.

But on the other hand we had already 2 sets of EPA values you stated:

7th: current label data (adjusted to old EPA?)
8th: simple label data (adjusted to new EPA?)

So I don't see why or how do we get a 3rd set of EPA values... and they are far better than the new (8th column) or even old (7th column) EPA values.

How many EPA testing methodologies exist anyway???

[ken1784]

Originally Posted by jprates

How many EPA testing methodologies exist anyway???

You'll find an answer on the followig video found at 2008 Fuel Economy Tests

http://www.fueleconomy.gov/feg/video...el-Economy.wmv

Ken@Japan

edit: for old EPA test adjustment, please refer to page-2 of following PDF.
http://www.fueleconomy.gov/feg/FEG2007.pdf
"EPA miles-per-gallon (MPG) estimates are based on lab testing and are adjusted downward (10% for the city estimate and 22% for the highway)"