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Your car's transmission is this:
1st: 3.55
2nd: 1.89
3rd: 1.28
4th: 0.91
5th: 0.76
Rev: 3.27
Final: 3.79
According to this
source, if that's the same care you're driving, you have pretty much the same ratios as a metro XFi except for 1st gear (yours is a tad more torqued) - which no hypermiler stays in for very long anyway. Those ratios aren't going to get much better; I wouldn't touch the gearing in that tranny - you'd be hard pressed to find anything better that would fit the '01. Try to find a 1.0l engine that will pop on that tranny if you want to get dirty. That may improve your fuel efficiency. Too bad it's an automatic