Just did 450km of of P&G around the city in my 91 metro, and I only gained 1 MPG over normal driving.
I was pulsing with normal (~3/4) throttle, in normal shift range, timing my pulses for as little braking as possible, no EOC. Basically it was all going smooth (other than my slightly jerky revmatching skills), lots of my glides were 3-4x longer than pulses, and I was hoping for better results.
My car seems well mechanically other than (I believe) a dirty/corroded fuel tank, where sometimes the fuel supply (accelerator) is weak.
What can be wrong?