My alternative history of Who Killed the Electric Car? is the automakers made an honest counter proposal to CARB an offer zero emissions fleet vehicles for city, county, state goverments, plus corporations willing to join. That would have been a large test bed for EVs and hybrids that would be safer than offering them directly to individuals, work out the issues. Hybrids are becoming mainstream now, but the same tact might be applied to EVs, CNGs, and hydrogen vehicles. Governments and companies that have fleet vehicles will have fueling stations, so it won't be a limiting factor. The drivers are a captive audience. Data can be accumulated on vehicle performance. Once a performance milestone is reached, they can be offered to the public. I would add vehicles optimized for ethanol. Please correct me if necessary, but flex-vehicles don't seem to be optimized for ethanol - this could be done for fleets.
Might be a good proprosal for H2 Fuel Cell cars. EV I think there is a certain demand from consumers committed to EV who want to drive electric. CNG is already fairly heavily used by fleets, and that's where it seems to work best. Ethanol well all those GM and FORD flex fuel cars can already take E85 if they can get E85 and want to accept a lower cruising range. Also some cars can now take E15, which requires special "blender" pumps at the gas stations. If more stations had blender pumps, then consumers could "dial in" the amount of ethanol they wanted.