Being a 1993, If you have the time and are there...
Have a lok at the RPO service list on the spare tire cover..
It will have L27 for the Tuned Port 3800 V6
It will have the M13 Transmission ( 4T60-E )
It could either have the F17 2.84 gear ratio ( Fuel economy ratio ) or
a more performance minded FW2 3.06 Ratio
In good tune the 93 could do from 19-22 in town and 28-34 on the road depending on the gear ratio.. we have had the guys with the 2.84 ratio do as much as 34..
I actually pulled 31 in my Series II 3800 with a 3800 V6 in the trunk will all of my other junk, back seat was full up too, with the AC on and I was speeding a bit too... And still pulled down a 31, and I have the 3.06 ratio
BTW... The 89-91 SE and SSE have a place in my heart... I just love them
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