Efficiency of Otto Cycle

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Homework Statement


Estimate the change in volume of carbon dioxide if 'r' is increased from 10 to 11 (10% increase).

Assume 30 million cars, all use 1m^3 of fuel each year

Homework Equations



Efficiency of an Otto Cycle
η=1-r^(1-gamma)



The Attempt at a Solution



Original η=1-10^(1-gamma)
Final η=1-11^(1-gamma)

I then looked up a typical value of gamma (1.3), and worked out the efficiency of each

Original = 0.4988
Final = 0.5129

Not sure if this is right, as you weren't given the value of gamma.

Then I'm not entirely sure how to work out how much CO2 is produced from each m^3 of fuel, is it just multiplying by the efficiency?
Or have I gone completely wrong?
 

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