Yeah, gasoline is a better degreaser than mineral spirits. Somewhat more flammable - responsible adult precautions apply.

My go-to solvent for really tough jobs is white gas, otherwise marketed as 'camp fuel'. Very volatile and flammable, but in small quantities, using sensible precautions, it easily handles the worst jobs such as removing road tar, decals, decades old-caked on grease etc.

As far as eco-benefits, I find the water-based degreasers, since they are so poor at actually degreasing, require multiple applications in large volumes, and this mess ends down in the drain. Since these products depend more on the user rubbing and scraping, as opposed to the solvent actually doing the work, this requires quantities of rags, which are then discarded. Plus the large volume of water and detergents for hand cleaning. Net result: not very eco at all.

But products labelled 'eco' or 'green' help salve to eco-guilt in the first world - I guess. Bike-specific products are worse: rebranded standard industrial products sold in tiny containers at huge markups.