Blue is fast becoming the car manufacturers' colour of choice when it comes to promoting green credentials.
Hyundai is showing i-Blue in Geneva, based on the i30.
The i30 Blue has engine stop-start technology, which Hyundai calls Idle Stop and Go (ISG), that reduces average fuel consumption by 7% when combined with a 1.6-litre petrol engine.
Carbon dioxide emissions fall from 152g/km on the standard car to 142g/km on the Blue version.
A 1.4-litre petrol will be added to the range in some markets, lowering emissions to 135g/km.
The i30 Blue will go on sale later this year, and will be available as a five-door hatchback and estate, with a choice of 1.4- and 1.6-litre petrol engines.
The three-door version of the Hyundai i20, which cuts the cost of the already generously priced supermini yet further, is also on display.
There are seven engine options in common with the five-door model: three petrols and four diesels.
The entry-level 78bhp 1.2-litre petrol unit is expected to be the best-seller. In base Classic trim the 1.2-litre-powered car costs 8195, which is 450 less than the equivalent five-door version.
Trim levels will mirror the five-door car's, meaning Classic, Comfort and Style levels that are packed with kit.
The three-door Hyundai i20 is also 10kg lighter than the five-door version but beyond that, there's not a huge amount of difference to report.
The new i20 goes on sale in April.