I'm having a similar problem and I thought I'd post it here instead of making a new thread...
I bought a Dizzy Pop Tune right before winter and ever since I've been getting pretty bad mpg, do tunes have a big effect? I had an Cobb OTS 91 before and it was fine
Another factor that comes to mind is winter, Where I am from our winters are around -30°C (-22°F 14°F ) Does any one else get a big difference in mpg during cold seasons?
To give an example, with my tune and cold weather, I lose around 80 miles of range per tank, that's a lot considering the tank is so small.. Anyone else have this?