Quote:
Originally Posted by MidniteTRD
a follow up on this - just did a full oil change with QSUD 5W-30, then immediately drove 1400 miles up and down the east coast for Christmas vacation.
fully loaded with luggage and 4 passengers, AND a full Thule Sonic XL cargo box on the roof. still running the factory Dunlop AT20 highway tires. cruise set between 72-75 most of the trip. temps bounced between 65 and 35.
19.5 MPG average according to the trip computer. if we didn't have the cargo box on the roof i'm 100% sure we could have matched or bettered the 20 MPG highway rating. i'm not as concerned about city ratings since that can vary so much based on traffic and driving habits whereas highway driving is more steady state.
i know its not a direct comparison to running 20wt in the sump on the same route, but i think its fair to say you can get so close to (or in some cases, as good as) factory highway ratings running a 30 weight, that it hardly matters.
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Thanks for the update!
Glad to see the 5W-30 did very well for you. I agree a small change in oil viscosity barely makes any difference with the 4.0L as far as fuel economy is concerned. Aerodynamics, and specifically air density (cold weather) is what will knock it down 2-4 mpg, depending on how cold it gets where you live.
