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Don't know, but have tried.
I heard the same thing, complaints, about EthosFR and put in my Ford Tarus SES which was getting @ 26 mpg on the highway. After @ 3 months of running it I took a trip from Red River, NM to Dallas, Texas to visit my kids. I got 33 mpg and did nothing different but drive conservatively as I always do.
I have put the Platinum system on my TrailBlazer LS with an I6 engine and intend to drive to Dallas to visit again in a week. It's @ 1500 miles round trip, I do very little city driving while I am there, and have only had the system in place for @ 2 weeks with very little driving here in Red River since I have an old 4x4 that suits my purpose.
I'll return and give you a heads up if it actually helped. I usually get 20 mpg on the highway, no towing, not loaded or over loaded, just me my dogs and a squeeze.
DocHaley
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