ok, I think I got it now.
These modern cars such as the
Toyota CH-R which are 1.2T's let you drive around in a car that basically is a 1.2 and enjoy fuel efficiency of a 1.2L car instead of the 2.0/2.4 that they should be.
When cruising they are a 1.2 so using that amount of fuel and no more.
When more power is needed, they can get the power of the 2.0 when the boost comes on.
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2003 Renault Scenic - 30% more power with no loss in fuel economy.
1991 Toyota GT4 - more economical before ST215W engine-swap.
previous: Water-Injected Mitsubishi ~33% improved.
future - probably a Prius
