Originally Posted By: ARB1977
The 3.4L calls for 30w but either way it's working well for you. What's your gas milage like?
Ehh, I'm no expert on oil, but I'm hardly an idiot and am also a chemist so I'm using my own judgement as an educated and informed consumer to judge that a 40 is good enough for me and that Rotella has excellent statistics at a $20/gal price point which was the driving factor behind my idea to use it. Moreover, I had used this at 3.5k and 5k intervals before I decided to try a 7.5k and send in a UOA though this oil is cheap enough to likely do 5k-ish intervals blindly.
With that said, my mpg when driving like a rage monster used to be 15-16 in summertime (265/75 A/T tires) and about 12.5 in winter mostly because I like to drift around the neighborhood, and living in WNY, we tend to get some heavy stuff. Now that I started short-shifting, I get about 18.5-19.5 in summer and I got between 16-17 in winter. Doubly, I ususaly had worse gas mileage on highway trips because the RPMs are so high at the speed I would be running (maybe 80 at the max), but when in my most recent trip to Ohio and back, I got something like 20.04mpg or so with a lot of city driving to all the breweries around Cleveland, never going more than 73ish except for the short stretch in Ohio that has a 70mph limit, then I'd go to 77. Then on the return trip I got 19.8ish which pretty much matches my city-driving so I'm quite happy with my mpg, honestly.