One thing to consider is that all Pontiac are not created equal when it comes to cooling. Radiator surface area is a game changer! Making a radiator thicker is diminishing returns. The older cars have really small surface area radiators (Not good).
One thing that handicaps new car mileage is weight. All the crap that we can't live without these days. My '01 Saturn SL2 would knock down 34mpg while running the crap out of it and 80 mph on the highway. But it was a tiny, light, car. Those 1.9's are great engines! Just better watch the oil when they get over 100k!
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