Quote:
Originally Posted by niky
This was the same problem with Mazda's iStop. The EPA city cycle doesn't show its effects, even though real world testing has shown a 0.5 to 1 km/l difference in 8 km/l traffic.
We have to wait to see what Mazda does. I am assuming that it uses HCCI over a wider cycle than GM's older system precisely because it uses spark-controlled compression ignition.
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EPA 5-cycle testing goes all the way up to 85 mph (US06 cycle). The 5-cycle test is used for the window sticker. The 2-cycle test (FTP75+HwFET) is used for GHG and CAFE compliance and the highest speed on the HwFET is 65 mph as stated. 5-cycle test results are much closer to real-world averages. Also, iStop would get GHG credit from EPA through their off-cycle credit program - so if the Mazda chooses iStop in the U.S., they can put it on the vehicle and take the credit towards their GHG compliance. If it isn't offered, it may be for consumer acceptance reasons or it could be that they just don't need it to meet the current standards.