Has anyone ever attempted this and made it? Or in the opposite direction? (Gen III - 2) (stock 15's) I don't know the exact address in Sacramento, but from my house to the Sacramento city limits it's 580 miles. If I fill up with Premium and top it off, max out the air pressure in the tires, do you think it's possible? We'll be traveling starting at 8pm, so traffic should be ideal for using the cruise control (65-70mph). i just made a 140 mile RT from Portland this weekend down I-5 in not ideal traffic and also driving between 70-80 mph with regular unleaded and still averaged about 50mpg (calculated). My primary concern is what happens to my MPG once I hit the Siskiyou Pass. I know I'll make some of it up coming back down the other side, but going up and over.............who knows.