the shift points in the 80E are set up for highway driving mostly. they dont let the rpms get real high between shifts like a tow tune would.
Also towing isnt recommended in the 80e
If you are looking to get 3 tunes i would suggest 40 tow 80E and 120race.
Most people get better mileage out of the higher HP tunes if they keep their foot out of it.
Also gauges are a must