Where I'm at it hasn't been much over $4/gal but we had cheap gas to begin with, and it still went up almost 100% relative to what it was. My gas budget for the month has had to eat into my "everything else" budget.
My old contacts from the truck stop have reported less traffic for trucks too, meaning the fuel surcharges have hit shipping hard as well. Not to mention, a significant chunk of our fertilizer came directly through the Strait of Hormuz before all this stuff started up -- we haven't even seen the start of the real problems and probably won't until it's harvest season.
Frankly what has me more surprised than anything is that we haven't started to see fuel shortages or rationing yet. Especially since diplomatically we're in a much more precarious spot than we were in the 1970's oil crisis.