Earlier quoted context omitted.
In this case there isn't even a link to rightwingnut.com though. Just a claim that you need to do math. Parroting climate-denying, anti-intellectual nonsense is worth calling out.
The study EnigmaticLion linked is as bad as you might expect. They have a chart showing CO2 per calories for different foods which goes from 11 to 1431. But when they do the final result for a bicycle using some kind of global average food consumption they use the number .144! Unless I've really messed up my math, the number for a bicycle should be around 200 to 1000 times higher than what they show. Next they take c…
You have.
The chart is in (g per 100 kcal)
>"magic math" and change them from 42 g/km to 229g/km.
42 is for production of the car 229 is for ‘well to wheel' emissions (i.e. exhaust-pipe plus those emitted to produce the petrol).
No "magic" required.