Ford's new Fiesta ST hot-hatch will emit around 125g/km of CO2 when it is launched: a reduction of 11% compared to the previous generation ST200, according to Ford data.
The supermini, which is powered by a 200PS 1.5-litre EcoBoost engine, uses technology such as a new combination of port fuel injection and direct fuel injection which works alongside cylinder deactivation technology to improve efficiency.
Officially homologated fuel efficiency and CO2 emission figures will be published closer to the on-sale date in June.
The third-generation Fiesta ST is the first to be offered with an optional Quaife LSD, helping to optimise front-end traction for enhanced cornering ability.
It will also be the first Fiest ST to feature selectable drive Modes that enable engine, steering and stability controls to be configured to normal, sport and track settings
Leo Roeks, European Ford Performance director, said: "Hot-hatch drivers are expecting big things from this small car.
"We’ve applied what we’ve learned from recent Ford Performance models including the Focus RS and Ford GT to develop an all-new Fiesta ST that sets a new standard for driving fun in its segment, with a throaty three-cylinder soundtrack that will speak to petrol-heads whatever their language."
The ST will be available from launch in three-door and five-door bodystyles with sporty ST exterior styling and standard 17-inch or optional 18-inch alloy wheels.
Three equipment grades will be available: ST-1, ST-2 and ST-3.
Standard interior features include Recaro seats, ST gearknob, and flat-bottomed steering wheel with stitching that is replicated on the leather handbrake lever and gear-lever gaiter, and a SYNC 3 communications and entertainment system with 6.5-inch screen or optional 8-inch screen.
Standard driver assistance technologies include lane keeping aid, lane keeping alert and cruise control with adjustable speed limiter, while features including rain-sensing wipers, automatic headlamps, auto-highbeam and traffic sign recognition also are available.