Citroën have been saying for some time now that they will produce a diesel hybrid, it should be available this year. We'll see. And if so, it's very likely that it will also be available for Peugeot soon. (And Ford, Volvo, possibly Mini, who are also using the 1.6 l PSA diesel.)

In any case, when comparing mpg figures for diesel and gasoline, keep in mind that one litre of gasoline weighs 740 g, diesel 890 g. The relation for CO2 emissions per consumed litre is the same as the weight relation (or very close). - Unless of course if you like many others are only interested in the financial consequences, then you only need to bother with mpg and per litre (gallon) prices.

(Footnote: the european manufacturers discussed years ago producing cars with CO2 emissions less than 90 g/km. With gasoline, that's around 3.8 litre/100 km. With diesel, it's 3.2 l/100 km. So the idea became known as the "three-litre car". Everyone soon forgot about all this, and then VW launched their Lupo 3L with a consumption of 2.99 l/100 km. Diesel.)