Old push-rod motors get better mileage compared to their overhead cam counter parts. Witch is also why a GM 3.8l = 200hp, and a honda 2.0l = 197hp. Of course the bigger GM 3.8 has more torque. In fact, this is what got me started hyper-miling! My G/F had an 02 Monte Carlo SS, and I had a 2.2l accord, and she was getting better mileage, and I said WTF? I went form ~25 mpg to solid mid 30's average, just by changing my driving.
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