I'm assuming there are no charging stations anywhere along I-10 (or along that 125-mile leg) or you wouldn't be asking if your trip is feasible.
Although dangerous to windshields and front-end paint, drafting a semi truck (eg. 1.5 car lengths) will conserve many Watts. I got good at it in my gen-1 Insights and could exceed 100 mpg. You can get a feel for the semi drivers who don't like truck-suckers (my term) because they make a point of straying onto the shoulder to kick up a few rocks. Back off quickly and look for a friendlier semi. Another benefit of following a semi (even if not closely) is speedy drivers won't tailgate you in an effort to persuade you to drive faster in the right lane.