I ran it for a while and other than it being pretty slow pulling out when loaded it was a pretty good swap. I never did get to say what kind of improvement it got. A nearby station started getting E0 again last month so my bike and Metro both are running E0 again but the Astro is no longer a gas engine car. I put a 6.5 diesel in it a few months ago. So now it has no problem getting 25mpg and will probably easily get 30mpg this summer.
I still think for someone doing lots of driving under 45mph it is a good swap. But if you want the car to accelerate fast it is going to probably get worse mileage. Just normal easy driving on the thing really was nice though with the engine never having to rev up. I really think it could have given me around 20% better mileage while driving under 45 with the converter unlocked.