Greetings, volks!

A quick question regarding gas mileage.  My Westy currently gets very
poor mileage (around 14 mpg) and I'm wondering why.  Last visit to the
mechanic revealed that my catalytic converter is a hollow box; would
this effect fuel efficiency?

Anything else that typically decreases the mpg?  I've had it for just
over six months now, so the likelihood that it needs standard
replacements (O2 sensor, etc) is great.

A cc reply to my email (afslj1@uaa.alaska.edu) is greatly appreciated!

Thanks!

Steve Johnson
Anchorage, AK