Manufacturing an EV requires 14 ton CO2e, whereas an ICE requires 10 ton CO2e. A gallon of gas emits 9 kg of CO2 (most of the weight is air oxygen). So equiv

Manufacturing an EV requires 14 ton CO2e, whereas an ICE requires 10 ton CO2e. A gallon of gas emits 9 kg of CO2 (most of the weight is air oxygen). So equivalence is hit once you burn 450 gallons of gas. IOW, not very long. (This ignores the carbon cost of electricity generation which varies widely. But it also ignores the carbon cost to create & transport the gasoline, which adds about 50% to the CO2 per gallon).