EGR?

[Dave Williams]

-> > 2-3 mpg, right off the top.  The first test a line mechanic does
-> when a > customer brings a vehicle in with a lost-mileage complaint
-> is an EGR > valve test.

> It is?  And here I always asked "When was the last tune up" as the
> first test. ; )

 Jeez, you must work in an ancient dealership!  Modern dealerships
employ "ticket writers" to interface with customer-vermin; the
relationship between the problem on the ticket and what the customer
brought the car in for is sometimes tenuous.  In any event, no line
mechanic ever deals with a customer nowadays.  They might get cooties or
something.