The five-seat Seat Altea and seven-seat Altea XL are the latest models to be added to the Ecomotive range, which currently includes Ibiza, Leon and Alhambra models.
Both the Altea and Altea XL Ecomotive models boast emissions of 119g/km, meaning an exemption from first year road tax in the UK.
Fuel economy in both cars is 62.8mpg on the combined cycle, putting the Ecomotive ahead of many of its rivals.
The power comes from a 1.6-litre TDI engine taken from the Leon Ecomotive and boasting fuel-saving common rail technology, a diesel particulate filter, Start/Stop technology and a Brake Energy Recovery system.
Seat will make the Altea and Altea XL Ecomotive available in S and SE trim levels, as it has with the Leon Ecomotive, and standard equipment is generous for both.
Standard equipment in the entry-level S trim includes air conditioning, electric windows, a six-speaker stereo with MP3 compatibility and 16" alloy wheels.
Fuel saving tyre pressure monitoring used in the Seat Leon Ecomotive comes as standard and ESP, ABS, TSC and hill hold control are all included in the new models.
There is also a list of extra equipment available, including bi-xenon headlights, auto lights and wipers, a DAB radio tuner and Seat’s Optical Parking System.
Both new models made their debut to the UK media this week and will be the fourth and fifth Ecomotive models in the Spanish manufacturer’s range.