How does weight affects fuel consumption?

I have a question for an upcoming challange… how weight affects the fuel consumption of a car?
Anyone have a equation, formula or something?
I only know that heavier equals to more consumption, but that’s it.

Maybe this could help? I’m not sure.

EDIT: also Physics. Physics could help a lot. I’m not good enough with physics to comment though.

A general rule of thumb is that you gain roughly 1 US mpg for every 100 pounds removed.

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Hmm … from a physics perspective, I would expect the effect to come from the acceleration component of fuel economy and an increase in rolling resistance. The latter might be a little tricky, but the former … E = mv2, so it should be proportional to the mass…

*opens up .lua file*

Maybe just take the Acceleration value in the Economies table, multiply it by the ratio of prior and posterior weight, and add the Cruise value? So if the Acceleration total is 5.89 and the Cruise total is 14.83, the base fuel economy would be 20.72 lt/100 km and a 10% increase in weight would add 0.59 lt/100 km to make 21.31 lt/100 km.

(Does it show the total acceleration fuel consumption in-game? if so, you can use the in-game numbers the same way.)

That doesn’t take care of rolling resistance, but I think aerodynamic drag is the larger factor? Anyway, that’s my first thought.

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