There are gasoline and diesel 121s. Gasoline 121s come in 3 engine capacities.
1.3L
1.5L
1.8L
Out of these three 1.3L is not that good with fuel economy.
The other 2 depends on your daily driving conditions. If you drive in city limits mostly with traffic 1.5L would do better on fuel.
If it is long journeys including highways, 1.8 L would do better.
And of course manual one would do better on fuel than the auto, but sadly most of the manual ones came with 1.3L engine which is underpowered.