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It should be noted that due to ownership of various brands, the same engines crop up in deferent "makes"
Renault==Dacia and engines are shared with Nissan.
Volkswagon == seat == skoda (and several other brands)
peugeot == citroen (and in some cases == toyota too. The Aygo/C1/106 are all built on the same production line)
Mitsubishi, Ford, Hyundai and Suzuki tend to be more independent.
Apart from the vehicle mass, how a car's driven (especially turbos) has a huge effect on its economy.
The idea of these wee engines is that they're operating at higher efficiency but the moment the turbo (and in some cases supercharger) spins up to give a power boost that efficiency falls away a bit.
Revvy little 3cyl engines tend to lend themselves to peppy driving with heavy use of the brakes (which is where energy gets dumped). It can be difficult to restrain this, but small engine economy is extremely sensitive to driving style.
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