Start with what the Pontiac G5 is: a car with gasoline engine, from Pontiac. What it meant takes a little longer.
The engineering
The engine is gasoline engine. These are manufacturer figures carried by Wikipedia and Wikidata, not road-test measurements.
Where it sits
Its Pontiac stablemates include the Pontiac 2+2 and the Pontiac 6.
The record
The open record for the Pontiac G5 carries no verified engine, output, weight or price yet. MotorJury does not fill gaps with guesses; this entry gives the model a home in the catalogue and grows as sourced specifications and photographs arrive. Corrections: corrections@motorjury.com.