http://www.burningman.com/preparation/t ... o_brc.html
Eugene . . . to
Klamath Falls (I like to get water & bread here at the full-service Fred Meyer; you can google it) . . . to
Alturas, CA (Fill up on gas--in case it's night, esp. if worried about Cedarville's gas station being closed) . . . to
Cedarville (BBQ available, even fairly late) to . . .
just North of Gerlach (not actually passing through it, but turning left North of Gerlach and driving to the playa).
It will take about 15 hours at the fastest, plus the multiple hours in line you will wait at the busiest times, so I highly recommend breaking the trip into 2 days with a sleep stop in central Oregon some time after Eugene. Careful about taking impromptu potty breaks near rivers; there are some vicious biting flies near Oregon's rivers.
In the last few hours of the trip you have to slow down--one reason why Google Maps' estimate of 12.5 hours (haha!) for the entire trip is not
going to be accurate. Route 447 is twisty, and there are free-range cows in the road occasionally; they like the warmth of the asphalt at night. Avoid.
The kamikaze bunnies, alas, you must mow down, because it's safer to hit them than to swerve. (Some of those roads have no shoulder--or a really soft shoulder--and you can get stuck at minimum.)