[scubascooby]

I was pondering a 5th gear ratio swap on the Impreza Sport by using the 5th from a Turbo (WRX). This would change the gearing from about 21mph/1000rpm to about 24mph/1000rpm

A typical 75-85mph motorway cruise would then be at 3100-3500 rpm instead of 3500-4000. No doubt it would slow acceleration on steeper inclines and require a drop to 4th.

The ratio swap would be no easy task on the Impreza, so it's well beyond my tools and time.

I have all ready increased the tyres from 205/50R16 to 205/55R16 to raise all the ratios slightly plus the speedo doesn't over-read by as much as before. There was no obvious change in economy because the odometer doesn't know of the change.