hypertech gauges?

[umbilicalbungee]

Hey, anybody have any experience with using the hypertech devices?: Hypertech, Inc.

It looks like the E-con model would be most suited for hypermilers, but the site product descriptions don't give many specifics. Its hard to tell if these even track things like MPG. Beyond that, I wonder if the claims of engine/fuel efficiency could be true and cost effective.

Thanks