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I doubt it, Ford would not give you more gearing than you need. There’s a gearing sweet spot where steeper gearing may give you better fuel economy(Over a stock setup), but go too far and it will fall off a cliff. Ford, needing to maintain happiness at the EPA would NOT give you too much gearing. Iirc the 10 speed has 3 overdrives. Your not going to see issues with 35s and 4.70s it will feel perfect.so with 35" wouldn't 4.54 get better MPG when compared to 4.7s?
Now with that said, 4.70s and 33s would probably start to do the opposite on fuel economy, your RPM would be higher and I’m not sure that triple overdrives could save you from losing some fuel economy.
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