I have searched but don't see any clear answer which surprises me. If there isn't a financial benefit to alt fuels then forget it.

Is there alt fuel with a positive ROI (say over 5 years even) including upgrades/mods needed and anticipated problems/maintenance? This is a strictly financial question, I don't care a rats *** about global warming BS and will not pay to be 'green'.

B5 and B100 bio at the pump here in the Bay Area is about the same as regular diesel. No cost advantage.

SVO is more expensive than diesel and requires expensive upgrades.

WVO? Seems like it's highly dependent if you can find a reliable source.

Homebrew? Positive ROI?

I would run this in my '06 Superduty 6.0 Diesel.