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A turbocharged engine is always more efficient than na, there's a reason seim trucks are turbo. However there's a bigger range in gas mileage do to having bigger injectors. To get better mileage you should also do things like a 1 piece ds and stiffer motor mounts to reduce your drive train loss. Higher gear ratios might help you get better mileage on the freeway but you might have to give it more gas in city driving to get the same acceleration. I noticed a big jump in gas mileage with a manual sr compared to the stock auto ka24de. To answer your question though an ls1 would probably be the best swap for gas mileage.
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