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Saudi Aramco has teamed up with major automakers, like Hyundai, to develop an “ultra lean-burn” fuel for hybrid gas-electric vehicles that would still use petroleum.

Worryingly, modern energy-efficient lean-burn engines may be more susceptible, Herbert Puempel, an aviation expert at the World Meteorological Organization, warned in the group’s journal.

Once the car’s started and warmed up a little, however, the second mode engages a lean-burn strategy in a more efficient mode that can be used when accelerating or in normal driving.

The credit included the advanced lean-burn technology motor vehicle credit, which was available to buyers of qualifying vehicles that were certified by manufacturers as meeting certain emissions standards.

The upgrade included adding a lean-burn feedback system, renowned for its efficiency in maximizing horsepower at the same time it keeps fuel flow to a minimum.