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FE is determined by frontal area * Cd, by curb weight * CRR, and by the efficiency of the powerplant. So short wheelbase cars get better gas mileage to the extent that they are small, slippery, and lightweight.
Correlation does not prove causation. Rather, what we have here is that cars which are small have good FE, and cars which are small have short wheelbases. But moving the wheels closer together on your Neon would be inadvisable and ineffective.
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