I was thinking about gettting a 2006/2007 6.0 but I really want 35" tires. What mpg are you guys getting?

 

I get about 14 in the city and 17-18 on the highway.

 

12 to 13 per tank!

 

13-15 mpg highway my god how are you getting 17-18, i was getting that prior to get 35's but not now it WILL decrease your mileage.

 

10 towing, down from 11- 11.5. 13 town, down from 14-15. Don't know for sure on highway because I'm typically towing on the highway. Your mileage will certainly decrease, supposedly even more if a mud tire is chosen over an all-terrain tire.

Mud tires look great (IMHO) and certainly perform very well off-road but there is undoubtedly a price to pay in decreased fuel mileage.

Bowie, what will you use the truck for?

 

I used to average 13 mixed with my mud tires, but since switching to an all-terrain I've actually gained 2 MPG! Also some higher MPGs could be attributed to aftermarket upgrades.

 

Well honestly I was looking at either getting a low mileage 06/07 or a new 08. The mileage sounds terrible on the new ones and will only get worse with 35" tires.

But what I will be using it for will mainly be a daily driver, and towing a ski boat on the weekends in the summer. My sister has asked to use it to compare to her truck which is the chevy 8.1Liter engine. She of course wants a diesel now though.

 

With 35s you WILL lose 2-3 mpg, I know because when I lifted my truck, that's exactly what happened. Instead of getting 18mpg or better like I used to; I started getting 14, 15, and when my truck was in the rare mood, 16. Since re-gearing my truck to 4.10 I'm getting about 18 again. Which brings me to my next point, 35s and 3.73s do not mix. With the 3.73s my truck would almost litterally drink diesel down; now with the 4.10s, my truck sips diesel. If you're looking to maintain stock mileage and power, use 4.10 gears and nothing else; if you go higher with 35s (i.e. 4.30s or 4.56s), you are over compensating and your truck WILL run out of steam in the higher rpms, and really start to drink down diesel.

 

I guess I am suprised that these diesels can't handle the 35" tires better. I thought they were torque monsters, especially at low rpms. I would think if you are keeping the rpms down like on the freeway then 35" might actully help out. They come stock with 33" tires. Heck my jeep went from 29" tires to 33" tires and I had almost the same mpg I just could not use 5 gear.(did not need to as 4th gear went around 70 mph)



So if I am going to plan on putting on 35" tires then I will need to get 4.10 gears.

I might not need stock power as all I will be towing is a 19' ski boat.

Any thoughts?

 

Bowie, I don't think you'll have a power problem, but your fuel mileage will drop. Another poster above mentioned going to 4.10s fixed his MPGs. I think you just have to pay if you go to bigger tires.

My stock tires could get me close to 20 MPG on the fwy at constant speeds. With my 305s (just a tad under 34" tires), I can't quite get it up to 18 anymore. But no problem with a loaded camper pulling a trailer full of horses and gear. It definately is a tad more sluggish when empty, but I don't mind as I'm not much of a racer in the truck...

My new tires weighed about 20 lbs more each -- much of that is out in the tread, which takes more power to turn and keep it turning. So it's not just a diameter difference, it's that + weight + how resistant the tire is to rolling ( Highway=best, then an AT, then a Mud and so on...).

I like the looks of my truck with the bigger tires and I figure that the mileage drop is the cost of a little ego boost....

 

That is a 7.3 the 6.0 is not a 3er

 

8mpg city....just took a long trip from NJ to VT and never saw above 11.5!!! this is the SD CC., short bed with a teneou cover. HORRIBLE!

 

Don't get me wrong, my truck could still roast tires and really get going from a stop, but it just wouldn't do it efficiently. The long and short of it, with a diesel, power is NEVER an issue.....

 

What's the weight of the boat/trailer combo?

 

So the weight of the boat and trailer will be 6000lbs