[hayden55]

Basically just copying motorcycles at this point for a small weight loss, and then knocking down engine displacement since the torque figure needed to propel the car is significantly small under most loads.
Imagine this a Geo metro made 58 lb-ft of torque for a 1690lb car.
A Ford Fiesta makes 148 lb-ft (many contest is under-rated) and weighs 2750.

The above values.
Wt. per lb-ft - 1680/58 = 28.96 pounds per ft-lb of motor torque.
Wt. per lb-ft - 2750/148 = 18.58 pounds per ft-lb of motor torque. 56% better value.

Then Total gearing values for each on the first three gears the Fiesta has about 7.5% more gear, but top gear is much lower on the rpms for the fiesta.
So I say it will drive just fine. It is heavier though so it wont get close to geo metro mpgs, but it will do well for the power and comfort the car has, and well not worrying as much about dying if you rear end someone.