[drew2000]

If you want better mileage in town, 155/80/13 tires on Civic VX 13" wheels at 44-51psi and a k&n intake filter might help. Remove all sound deadening and unnecessary weight. Power steering belt and a/c delete will give a bit more power. Turn off the car at every light instead of idling.

Other than that, I think you'll need a smaller more fuel efficient engine. My 95 Tercel gets 36mpg driving really hard around town and 43-47mpg on the freeway. You could swap a 5efe or 4efte into the Rolla, but it would be easier to trade cars.

For an engine swap, I've always thought the turbo Firefly 1.0l motor might get a little better mileage since it's only 3/4 of an engine; haha.