Eco racing?

[Ecky]

Originally Posted by cRiPpLe_rOoStEr

No wonder some Brazilian econobox with a 1.0L engine due to lower taxation, while having a slightly better fuel economy in city traffic, won't be so much better than the same model with a 1.6L engine instead.

It's possible to go too small. There's an optimal engine size/output for a given use case. Downsizing works because generally engines are above that optimal size.

[cRiPpLe_rOoStEr]

Originally Posted by Ecky

Downsizing works because generally engines are above that optimal size.

Either they're above that optimal size, or below. No wonder sometimes a small naturally-aspirated engine may have an awful fuel consumption, while the very same engine in a turbocharged trim will be better suited.