Of the total 5900 miles on this UOA, we towed our 25' travel trailer (4300lbs loaded) over 4,000miles over the summer. 2,500+ of which were in and all around the Smokey mountains and vicinity for 2 weeks, plus another easy 1k+ of in State towing. (That's actual loaded, towing mileage.) Remaining miles were all local city, short, grocery getting type miles. MPG's average around 10. The range was 9-12 between fill ups. And still a report this good? Those doubting 10k OCI's NOT TOWING should doubt no longer. I now question my own personal requirement to run 5w-30 during the spring-summer towing season. But I'm not yet there. I will stick to what is clearly...without ANY doubt....working exceptionally well. Oil used was standard M1 5w-30 (2-5qt jugs) from Walmart.