- "Hot enough for ya?"
The Mars Gas Corporation is a gas supplying company who supply gas to residents in Liberty City. Although there is no base of operations in Liberty City, their Mule vans appear through out the city with their logo on the side. However, there are two pipelines running to/from the north and south of Staunton Island with labels/warnings reading "High Press. Gas" and "Hot Steam", although it's obvious that the developers only put them there to stop the player from accessing Shoreside Vale via boat before it is unlocked.
In the vein of Rockstar humor, "Mars Gas" sounds similar to "Arse Gas", a reference to flatulence.