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your inputs will be appreciated

FX35 is very okay, but if you need extra pound of punch those beefy torque and serious horses, the FX455 is way to go. They're powerful and fast but FX45 will cost you more cash to run and maintain. You can use normal unleaded petrol in FX35, you must use premium fuel in FX45 (I read it in their manual). Other than that I see no difference.

Would suggest you go for the Infinity FX 35 because it has a very good sport sedan handling, powerful V6, roomy interior for four, long list of standard features while the infinity FX 45 has a Minimal cargo room, large blind spots, doesn't feel as upscale as some peers, no third-row seat available.