No problem, and it is certain to be less $$$ than a new car.
The other reason, if I remember correctly, for the difference in MPG was the gear ratio of the transmissions. The 2.4 generally had a numerically higher gear ratio to account for the smaller motor moving a relatively heavy car. The 2.4 was originally designed for the neon after all <grin>.
One other MPG gain I have seen on my old neon, if you decide to keep this car, was an underdrive pulley. It reduces the load from the power steering, AC and alternator by effectively spinning them slower. The only downside to this is if you idle for long periods of time with all the lights, etc on. In which case the battery could run down. It is not generally an issue on highway or normal in town driving. I currently have one on order for the current neon (took me a bit to find one for a first generation).
The other advantage to keeping the car is that you know the history of this vehicle. That can often be priceless.
Jim
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