ok ladies and gents..a girl said that 93 octane gas cost the most because it was made the most recently and 89 being the oldest is cheapest!

Not true, the numbers represent the octane rating. 93 has a higher octane rating than 89.that is the reason for the difference in price.

I think higher octane burns at a higher temp

Hmmm, interesting.

Look at the prices at the pump