When I drove my '01 Accord off the lot in Dec 2000, there was no 5w20 available at local autoparts stores. The first change was free at Honda and by the 2nd change, Pennz was the only 5w20 available locally. I used it to 10K and then switched to M1 5w30 for the next 90K. At 100K, my average weekly mileage decreased greatly, so I'm back using Pennz.
Last change I dumped a mixture of the yellow (5w20) and platinum (10w30) bottles at a 2to1 mixture (4.5qt sump). This is my High-Mileage, Home Depot brew. I believe this calculates to an 8.9cst blend at 100C, so it's still a 20W. I had it in my stash, so I just had to try it. LOL
I'm currently at 165K+, so my 4banger is just about broken in. :^)