Hey, the mileage is still fluctuating between 16-17L/100km. It has been idling quite a bit due to the cold weather and has only been driven in the city. I will be taking it on the highway this weekend so I expect the average will come down. Also after it breaks in and the weather changes I expect it to come down a bit as well.
I didn't really notice any performance or mileage changes with the increased tire size. Probably didn't notice any since I only had 1100 miles on it when I changed tires. My mileage has gotten steadily better since I got my Ram up till around 5000 miles. I had a trip about 120 miles where I averaged 21.8 MPG. My Ram is a 4x4 Longhorn that weighs right at 6000 lbs so I'm not complaining about the mileage. City mileage is bad though, usually 14-15. I have 3.92 gears. No leveling kit, I have the 4-corner active air suspension which prevents me from putting any type of lift on it except for a 6" coil over suspension lift which would completely replace my air suspension that I absolutely love.
I have the 3.92 with the Hemi. I picked it up last night and only have 50kms. I will check what the mileage is on it after I burn through this tank of gas and let you know. It warms up pretty fast I like that.
Hey, I ordered a limited with all available options (except Ram Box). It arrived here this week in Edmonton and I did the deal yesterday for 51,500 all in. I paid the whole sale price, minus rebates, minus an additional 500. I think we both got the best deals available.
I couldn't notice any changes in MPG or performance, because I never even drove my truck on the stock tires. I had them changed out before I took delivery and drove off the lot in my new truck.
A larger, heavier tire absolutely HAS to have an effect on MPG and performance. It's simple physics and no way around it. That said, it isn't much of a change and the 3.92's give good mechanical advantage. I would venture to guess, the difference is probably less than 1 MPG.
And, FWIW... My speedo is only off by about 1.5%, and the computer reported MPG is usually within 1 MPG of hand calculated. Those things are assuming stock tire size, so obviously, it really couldn't have made much difference.
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