Ok I have 3 Impreza's all 3 rs's and I notice when driving both n/a's at 80 mph one wasted more gas then the other? The 2000 rs 4D at 80 mph was at 3 rpm. And the 2001 2D was at 3.5 rmp. I don't know y? Does anyone know whats going on I'm using my 2D as my DD and it's wasting to much gas. The gas goes down faster then the 4D driving the same distance. Can anyone tell me y or what can I check out to see if somethings wrong? Both car r N/A's and are stock. Both 5 speed and both are rs's can anyone. Does anyone know what to do to make it save gas like my 4D???