Hi everyone,

Recently I had an experiments on removing the Diesel Particular Filter
(DPF) from my car. In modern Diesel engines this is very similar to the
'Catalyst' converters to the Petrol (Gas) counterparts. Manufacturers (and
eco engineers) are claiming that the filter would prevent releasing
diesel particles to the air, which is fine. However, after removing the
filter I have noticed that the fuel consumption is much better, it is 61
mpg (Imperial, or 51 us mpg, or 4.5 l/100km). Previously (with the DPF
still in) this figure was way worse, maybe I could achieve 40 mpg (33 us
mpg), which is not entirely surprising as the filter is basically a
blockage in the exhausting pipe system -- causing the engine work harder to
push the exhausting gas through that.

The question obviously is how burning more fuel is more "environment safe"?
In my mind it is purely wrong.

Tamas
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