I rode I5 from Seattle to Stockton, CA. Ran the PCH and realized I needed to have a lot of gas to make the run from Montery to San Louis Obispo. Hit up the Mulholland Freeway and the Rock Store as you're that close and may not return anytime soon.
Watch out for the Santa Anna winds, 80-90 mph and it feels like the finger of God pushing you off the road.
Take extra water and fill up everytime there's a gas station between China Lake and Las Vegas, there aren't a lot of gas stations on that route.
Northern AZ and NM has few stations, and desolate roads. Might want to have a stop-n-go tire plugger ready. Not as desolate as China Lake - Las Vegas, but still WAY out there.
From Raton NM, to Dalhart TX is roughly a 125 miles, no gas station last time I rode it, fill up.
Hwy 62 is boring in Oklahoma, I know as I live on it. Lawton is hell, watch your 6 and try to avoid Old Cache Road.
*You may want to change plans and ride from Lawton to Talhinia, take Hwy 71 to Paris AR, then to Harrision AR, and finish at Memphis, TN about a week later*
That's as far as I got from a few years ago when I did the same route. I stayed on RTE 66 and I40 myself for nostalgia.