hrtkd: slow down....everyone in the world has been told to drive the speed limit...now you tell me i have to drive 5 mph under to gain the best mileage...(sweet spot if you will)...that is gonna be hard to do when you have been driving for the last 24 years...
p.s. the gm at the dealer told me the same thing!!!
as for the oil: i would love to switch it, but the dealer does free oil changes as part of what they offer when buy a vehicle...kind of hard to pass that up.
scr38: 35 and 3-4 is what they say is typical of titan outcomes.. their reputation, product testing and testimonials gotta say otherwise... jmtc opinion and i appreciate yours too.
i agree that bigger tires affect mileage but i also learned that one the hard way as the titan is not able to re-program the computer as all my other vehicles were able to do... but to go from a 245 to a 265 tire can't affect it THAT bad, non the less it does affect it.
i think i will do a little more research and a couple of more tanks (without E85) and try and find some hiway travel at 65 to see what it get, then go back to dealer to complain.
anyone else have ideas??!!
Excellent points! I have LT tires that are load range D. Even though they are the OEM size these mothers are heavy and I only have them on my Titan when I tow. The Winter gas in the Colorado front range sucks. It's an automatic 1 to 3 MPG drain. The MPG difference between 65 and 75 MPH is astonishing. A friend of mine drove his '07 4x4 Armada with me to California this summer. He complained like crazy about me driving so slow. But after he fueled up a couple of times and calculated his MPG he shut up. He had not realized his Armada could get over 20 MPG.its not just the size but the weight that affects the mpg. Your 265 over the 245s have a higher friction between the tire and the road, this requires more power to overcome and etc....
Another thing you are overlooking is that it is winter time. They gas blend is slightly different and thus lower mpg. Then you add the E10 crap in there and it drops more. Then you need to look at what the published mpgs are and at which speed they are obtained. Most city is stop/go with 35mph but most hwy is something like 65mph. You are probably going 70+ and thus the lower mpg.