I'm not saying that you can't make it from Bakersfield to Valencia... You absolutely can. I just did a very similar
leg of your trip from about 400 feet elevation to 4200 feet, over 41 miles (which is what you'll have at Tejon Pass).
Very, very similar, except you may have significantly more heat, and you're on a freeway, so you'll want to drive way faster than my 40-45 mph. I crested that summit with 3 solid fuel bars. You will probably have less, but there is NO REASON why you can't coast in Neutral (not regen) almost all the way to Valencia.
You might be able to drive 55 mph for the first 25 miles to the base o the Grapevine, then really slow up the hill, like 25-30mph. If you cross the pass "on fumes", coast every down hill, using regen to keep your speed below 60mph, and crawl up the remaining small uphill parts at 25-30.
You'll know what you need to when you cross the pass. Make sure you have 100% in BFL. Pixley would only need enough charge (5 minutes per mile on L2) to get to Nissan in BFL.
Valencia, you'll be in control, so either just enough to get to SMO, or more, but not over 80% for regen on the remaining downhill.
Tony