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No, stock.

I've been running mine for about 5 months. No changes on MPG more than likely. I haven't kept close track. It dips in the winter, and goes back up in the spring/summer. Looks about like last year. No issues on drivability. I run 88 octane e15 and it feels just as strong as new.

I just went through a similar situation. 24k on my 2021 Lariat and I've been the only owner. Everything has been great, but while on a road trip I popped a P0420 code. No drivability issues. Dealer replaced the catalytic converter under warranty. I buy normal gas at normal places. Dropped the...