Can a diesel engine be too fuel-efficient? Maybe, at least if you are Audi of America and you're looking for a way to market diesel and hybrid powertrains side by side in the same vehicle. That's why the importer says it will put more of the accent on performance, rather than fuel economy, with its upcoming diesel-powered Q5, leaving room to emphasize miles per gallon with the cross/utility vehicle's planned hybrid-electric powertrain.
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