I was looking for a 1984ish 1.9L 4 speed before I got putt-putt. My first S-10 got me 33 mpg at 65 mph by advancing the distributor and NO hypermiling. My second S-10 was an 87 2.8L V6 4 speed that got mid 20's.
Not sure about the bigger 2.5L though. My best guess would be upper 20's and better. It would be a fun truck to play with and cheap to fix.
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