biopete - Not sure yet what my mpg is, haven't driven it much since I bought it. Can't be bad as I've drive 180 miles and the gauge is showing 2/3 - 3/4.

I'm really just trying to get rid of the racket coming from the engine compartment (see first post). And if it idled a little smoother that would be nice too.

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1986 300 SDL, gray on black, #14 head, 180K miles
1982 300 CD, silver on palomino, 290K+ miles [sold]
1980 300 SD, white on palomino, 500K+ miles when retired [uncle's car - inspiration for the above]