What's it like?
Quite frugal. While we didn't quite manage to reach Seat's claimed 85.6mpg on a combined cycle we did see over 50mpg following our test, and we have no doubt you'd start to see the difference on repeat longer motorway journeys.
The Leon's 108bhp 1.6-litre diesel engine pulls well from low down, but it's a noisy engine and at speed it's noticeably intrusive - a matter not helped by there also being plenty of wind and tyre noise.
One issue is as a result of the Ecomotive's very long gear ratios. It's not difficult to bog the engine down, especially when moving off or accelerating on an incline.
While the Leon handles well about town thanks to quick and accurate steering - which is admittedly devoid of any real feedback - the ride quality of this frugal hatchback suffers due to its lowered suspension.
Pleasingly very little has been altered in the Leon's cabin. That means it benefits from an ergonomic layout and decent build quality. It might not be the flashiest interior out there, but it's functional and comfortable for both drivers and passengers.
The Leon Ecomotive comes with a decent level of standard equipment including cruise control, air-con, Bluetooth connectivity and Seat's touch-screen infotainment system. All of that is further boosted by a free Technology Pack upgrade which adds LED headlights, a DAB radio and sat-nav.
Should I buy one?
Probably not – because in reality the sacrifices made for the Ecomotive's extra 11.3mpg over the standard 1.6-litre TDI Leon come at a high price.
Refinement really takes a hit at speed, as does ride quality about town, and in order to benefit from the Leon's extra frugality you either have to cover plenty of motorway miles or have very sharp eco-driving skills.
We're not sure whether the £990 premium for the Ecomotive model over the standard car is really good value either, especially when the standard model can already return a claimed 74.3mpg on a combined cycle, alongside CO2 emissions of 99g/km.
For private buyers, that's likely where the argument will end, and for our money we'd stick with the 1.6 TDI diesel.
Company car drivers, who might additionally benefit from the Ecomotive's extra range, will pay just fractionally less per month than the standard car on a 20 per cent rate.
Small differences, then, and ultimately a question of how much refinement you're willing to trade in for a potentially minimal improvement in economy.
Seat Leon Ecomotive
Price £19,660; 0-62mph 10.4sec; Top speed 122mph; Economy 85.6mpg; CO2 87g/km; Kerb weight 1260kg; Engine 1598cc, four-cylinder, diesel; Power 108bhp at 3200rpm; Torque 184lb ft at 1500rpm; Gearbox 6-speed manual