Posted by RN on March 08, 2014 at 13:33:05 from (66.188.143.138):
In Reply to: Re: fuel economy posted by rrlund on March 08, 2014 at 11:36:08:
EPA rules for the European diesels had a few quirks that made them economically impractical In US market. Awhile back it was the "use the current road fuel" that was higher sulfur compared to the European low sulfur fuel- pre 2007(?) when the ultra low sulfur became available in US. The crash standards for smallest models was minor issue. Another I read about on Smart cars was failed EPA tests for car class -but passed for heavy truck at the car standards. Seems the rules on testing required a OBD2 plug and computer control so testing machine could do shifting and throttle , spark advance without a operator/driver and get a readout- and the high mileage European Smart diesel getting 60+ mpg was a manual tranny missing the spark advance and couldn"t be auto shifted by the computer-car missing the plugin- record/readout. The over 10,000 truck class let a driver do manual shifting and throttle control with a tailpipe wand reading emissions at idle and cruise speeds- computer readout not mandatory although preferred- the default for not proper computer was the manual testing procedure but that wasn"t allowed on the car class. Smart Car in gas with auto trans passes EPA procedure test-but needs about $1500.00 factory cost for airbags, side impact, rollover protection and bumpers to meet US market requirements. Nissan Diesel cars and pickups have a engine current for US market-- but now the Diesel is higher than gasoline and engine a bit weak for the HP race. VW TDI-Turbo Direct Injection(?) engines have the power and economy- but cost is a bit more than some of market willing to pay so market share is not as good as European market- about 30% of light vehicles are diesel compared to about 10% in US market as of couple years back- and that figure includes the under 10,000 trucks with the various diesels from 5.9 Cummins to 7.4 Ford/IHC. RN
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