If Car A is more fuel efficient than Car B, would Car B release out more carbon monoxide than Car A?

Question

Let say that it is the same year when I compare to Toyota Corolla and Honda Civic and found that corolla is more fuel efficient for example

A better example would be comparing a Corolla to a Camry who use more fuel than Corolla

Answer 1

Not necessarily. It depends on the emissions controls installed on both cars
Car A could have no emissions controls, making the engine breathe more efficiently than car B. Car B could have the latest emissions controls, but breathe less efficiently because of them.
Car B would put out 100s times less emissions than car A.

Example. Motorcycles have smaller, more fuel efficient engines than those in the typical automobile. But a motorcycle spews out much more pollution because no motorcycles have emission controls.

Answer 2

Not necessarily, since you have given us no information. If car A is a 4 cylinder Honda with a fouled plug and a bad catalytic converter, and car B is a well tuned new Cadillac with an 8 cylinder, car A is more fuel efficient but a polluter, while car B is much cleaner but can't get past a station without stopping for fuel.

Answer 3

ABSOLUTELY NOT.

The question is not how much carbon monoxide
is released, but how much carbon dioxide is
released. Carbon monoxide is the gas produced
as a by product of the fuel and air burning to
emit carbon dioxide. For every gallon of gasoline
burned in an engine, 19 pounds of carbon dioxide
are produced regardless of how efficiently that
power is utilized in the vehicle's drive train.

Carbon monoxide is short lived and changes into
carbon dioxide in a very short time.

If a car gets 20 Miles to the gallon of gas and drives
15 miles in the morning, and 15 miles in the evening, how many pounds of carbon dioxide does this vehicle release into the atmosphere per week?

If a 747 Jet Airliner flies from New York to LAX using 2,700 gallons of jet fuel, and makes this flight 21 times per week, how much carbon dioxide does the 747 jet release into the upper atmosphere per week?

Answer 4

More carbon monoxide per hour or per gallon? Not necessarily. More carbon monoxide per mile? Probably, as the the more fuel efficient car will get further with the same amount of fuel (and thus the same amount of carbon monoxide). However, carbon monoxide emission also depends on other factors, so it would depend on the specifics of the cars in question.

Answer 5

No. If a car is more fuel efficient, then it burns fuel more efficiently. In chemical terms more products, less byproducts
fuel + oxygen -> CO2 + water + heat

A less efficient car doesn't burn fuel completely so you get
fuel + oxygen -> CO2 + water + heat + CO + etc

The less efficient burn = more incomplete combustion/reaction

Other factors: catalytic convert, quality of fuel

Answer 6

Yes

Answer 7

Yes, especially if car A is a diesel.

Answer 8

only if i was driving car b