Today I received the "I GET 50 MPG. YOU?" license plate frame I ordered from the GreenHybrid store. All advertising pitches aside: it's really nice! I was surprised. The white-on-black is extremely effective and I can now say with confidence that these license plate frames are quality stuff I'll post a picture soon.
There are mileages from 20 to 100 in increments of 5 MPG. It covers a small bit, but not enough that one can't tell what it says if they walk up to it. It's smaller than my old black one -- that's for sure.