According to this, the emissions for the 1.3 litre petrol version are 138g CO2/km. That wouldn't even qualify for the UK tax break for low-emission cars, which kicks in at under 120g/km.
The 1.3 litre Yaris diesel I bought instead emits 117g/km. As much as 60mpg on a carefully driven long run. It isn't, of course, fair to make a direct comparison between petrol and diesel. But I had a wide choice of small cars under the 120g/km threshold.
Fortunately, it was "only" about 30 miles away...
