What did you get ?

Three men are in a jail cell, discussing their crimes.
The first man asks the second man :
- What are you in here for ?
Second man says :
- Armed robbery.
- What did you get ?
- 12 years.
First man to third man :
- What are you in for ?
- Murder.
- What did you get ?
- 20 years.
Third man then asks the first man :
- And what are you in for ?
- Burning Abos with petrol.
- What did you get ?
- Eight to the gallon.