I'm a bit late to the party so to speak. We drive from Tucson to Edmonds and back several times each year- In a Model S, so YMMV, but we find that now it's pretty much a wash between using I-10-I-210-I5 ie ( AZ, CA, OR, WA)ie LA route vs I10-I17-US89, UT20, I-15, I84, I 82 and I 90(AZ, UT...