E10 or regular unleaded?

[BEEF]

The road taxes in the US are put on the price of gas. i live in north carolina where the road tax is relatively high compared to surrounding states. my parents make special trips to virginia to buy gas as it is usually 30+ cents cheaper per gallon. just not cost effective enough for me. my tank is small and my time is important.

Also, mixing e-10 and e-0 is fine. you'd end up with something in the middle (e-5 for example). i have heard that ethanol can produce more power than gasoline in a purpose built motor. it would need to be very high compression ratio (i've heard 17:1). though i don't know of any vehicles built this way (other than diesels), it would be cool to see it implemented. the flex fuel cars just advance and retard timing from what i hear.