Hi Lars-ss:
Quote:
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Originally Posted by lars-ss
Not really......Here's why not....
If a Prius drives 31 minutes, averaging 20 MPH, the MPG will be WAY SKEWED HIGH because of the use of the battery to drive the car, thus creating ZERO carbon emissions when the car is in electric mode. That's a HUGE advantage for the Prius in *THAT SPECIFIC SMALL TEST* which WILL NOT bear up over the long haul of a tank, unless, like I said, your normal commute mimics the test almost exactly.
So ANY TEST which forces the car into EV mode MORE THAN it would be in EV mode in the REAL WORLD is a faulty test, correct? |
___You may not be seeing the reality of the EPA’s city and highway tests. The results are what they are in the test(s) that are run even if the test forces a Prius II or Escape HEV into a sustained EV mode. The pack helps the Prius and Escape HEV run quite a bit of the FTP75 in EV but the overall FE and emissions are measured and are what they are because the gasoline ICE is what charges up the pack AND propels the Prius, Escape HEV, Insight, HCH, whatever etc. … If someone were playing the devils advocate, they might say non-hybrids do not have to run their ICE to recharge a pack so the results are flawed in favor of the non-hybrids! This is just as much bunk as the assumptions quoted. If you ran your HCH or a Prius II in the exact manner with the exact setup as that of the (2) EPA tests used for the estimated FE with the city/hwy deduction taken, you would receive very close to what the EPA did with both EV in the case of the Prius and Autostops in the case of the HCH. Any new Toyota Sequoia, Chevrolet Yukon, and Ford Expedition would come very close to their respective EPA estimates if setup per the manufacturers specs and over the same exacting test cycle as well. There is no faking anything. The bag measurement gives the amount of fuel consumed as well as emissions over the particular test cycle including the exact distance, acceleration rates, deceleration rates, as well as at idle/autostop/EV mode while sitting there ICE off during the non-hybrids idle portion of the same test.
___If you wanted to look at a hybrid in the negative per the EPA test cycles, you have heard of a NOx spike upon start of just about any ICE, right? The Hybrid’s have quite a few ICE starts and stops whereas the non-hybrid’s do not. What does that due to a hybrid’s overall NOx emissions? They still meet very clean std.’s including SULEV and LEV for the HCH depending on config, SULEV to LEV for the FEH depending on locale, SULEV for the Prius I and II as well as HH and RXh, SULEV, ULEV, or LEV for the Insight depending on fuel and config, and ULEV for the AH. They maintain their standing in the FTP75 and HWFET tests even though they had all of those opportunities for a higher NOx output with a NOx spike on every re-ignition. The CAT’s are warmed up to help of course but there is still a NOx spike no matter how small after a given period of ICE off.
___Good Luck
___Wayne R. Gerdes
___
Waynegerdes@earthlink.net