[19bonestock88]

It seems that nobody is suggesting the fairly obvious choice here. What OP need to put in his S-10 is another GM 2.2, the Ecotec. The first generation L61 is a simple engine to hook up and run and I can speak from experience that they’re pretty efficient. They also happen to love boost if the ~140hp/145lb/ft in stock trim is insufficient, and there are factory parts that can accomplish that from a junkyard, cheap. I’d wager that 30-35mpg wound be very doable with modest gearing and maybe some aero that were done at the same time as the swap