For what it's worth, my 1991 LX Coupe 5.0 (2.73 gears) was listed on the original sticker as:
17 MPG - CITY
24 MPG - HIGHWAY
The convertible is heavier so the MPG is probably slightly worse.
Hope this helps,
E
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1991 5.0 LX Coupe -37,800 miles
13.17 @ 106.14 mph w/ 2.138 60'
Pro-Charger D-1SC on the way!!!
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