Plans 1 (portal) and 3 (private investment) look interesting to me. I have limited knowledge of the diesel fuel business, and I have concerns about government regulations and whether or not this product would be subject to fuel taxes, etc, so Plan 2 does not excite me personally.
Plan 1 seems to have great potential, and Plan 3 seems to carry the least amount of risk, consequently the return is conservative. I'll be looking forward to reviewing in more detail.
pp