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Originally Posted by Jim H
While it should not leave a cloud like a diesel, it is not uncommon to see black smoke from high-performance gasoline engines under heavy acceleration.
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OK. Thanks. I asked my brother to drive my car while I drove his right behind. It's in fact rather a black puff than a big cloud of smoke when the gas pedal is floored at around 60- 70mph and another puff when the pedal is released. There is actually much more black smoke while accelarating at full throttle from 0 mph.
Quote:
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Originally Posted by Jim H
Your fuel economy could be low if the injection system is biased towards too rich all the time, and a lot of unburned fuel means the catalytic converter(s) have some overtime work to do. You might have your fuel management system checked.
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I get aroung 20 mpg driving mostly in the city which I assume is quite OK. 24 mpg on the highways.