I think a smaller engine working harder could use just as much fuel but maybe it could work. A simpler approach may be to look at other Mazdas of the same era and see if any of them share parts - especially the gearbox. If they do then you could relatively easily swap the engine for another Mazda unit - say from a 323 (1.3-1.6).
There was also the Mazda 626 Diesel which had a supercharged (instead of turbo) engine. I don't think they sold many though. I think you (Australia) had it as something else, Capella ?
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[I]So long and thanks for all the fish.[/I]
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