Startups promising to power planes, ships and trucks with clean fuel are sputtering before they get off the ground, showing how hard it will be to wean many industries off oil and gas. A company ...

This is noteworthy because some bottled fuel-injector cleaners may only be aimed at cleaning fuel-injector nozzles, while others may claim to also clean intake valves and combustion-chamber deposits.

The letter states, “As farmers, we are growing the feedstocks necessary for clean fuel production, such as corn, soybeans and other biomass. The 45Z tax credit has the potential to be a game-changer ...