Quote:
Originally Posted by oil pan 4
You're preaching to flock.
If you are getting real good fuel economy then your emmissions are likely well with in limits.
|
If you're talking about HC or CO, then I agree (because both are an indication of incomplete combustion).
Not true when you're talking about NOx. As a general rule, high NOx (pre-catalyst) and high efficiency go together.
Particulates (on a diesel) are a mixed bag. High engine-out smoke is like HC & CO--an indicator of inefficiency & unburned fuel. However, the addition of a diesel particualte filter (DPF) will hurt your overall fuel efficiency via higher back pressure and fuel used in filter regenerations. So low smoke generally means better efficiency, but ultra-low tailpipe smoke (via a DPF) will give you lower fuel efficiency.