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An engine/fan combo from an ultralight aircraft would fit the bill with what the OP wants...
That said that engine is suitable to push a 270lb aircraft and 150lb man around in a light wind... not a 4200lb SUV down a road. I don't think you would be able to obtain any sort of fuel economy gain...
If you want to prop an SUV skip the small props and go for a swamp boat propulsion system. Although I doubt you are going to get any better fuel economy than the engine in the SUV could provide....
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