If you burn 1kg of fuel how much does the total output weigh? Not just CO2?
Hey, that actually makes sense now. I've just checked the CO2 emissions figure for my car compared to the fuel comsuption. It burns 57 cm3 of fuel per km and produces 152g of CO2 per km. Thanks.
They say you learn something new everyday, but on Pprune it's got to be, uh, I don't know... at least twice that or something.
Edited to explain Eureka moment.