I have the 3.21 rear in a regular cab 2wd and 3.6. I get incredible fuel economy at 60 mph...something in the range of 32 mpg on level ground with no wind.
As I go faster (freeway driving) it gets worse. By 70 mph it has dropped to about 26 mpg and at 75 it was about 24 mpg. I began to wonder...if I did a lot of freeway driving (I don't as I live in rural Wisconsin) would it be better to have 3.55 gears with the 3.6L? Perhaps that would get me into a better power curve where the truck would do better at 70mph. I don't know. I can tell you that so far my fuel economy has been stellar with the 3.21 gears, only bothering me above 60 mph.
Can't tell you anything about the 3.21 but on the 3.55 I get around 30mpg on the highway if I keep it below 70mph, usually cruise around 65mph. Around town I get around 22mpg. Now this is a Canadian(Imperial) gallon so its a bit more than a us gallon.
Also my towing capacity on the 3.55 is around 7200 lbs vs 4100 lbs for the 3.21.
Thanks for the info. Plan on ordering a truck tomorrow. 2016 1500 quad cab 4x4 6.4 bed v6 outdoorsman black forest green 3.55 LSD . quite a change from my 2003 2500 quad 5.7 slt white 4x4. I'm hoping to get 18 mpg city and at least 23 highway at 69 mph.Is this realistic. I loved the 2500 but 9 mpg city and around 13.5 - 14.5 hwy cost me a tun in fuel.
I have the 3.55 and my son inlaw has the 3.21. Mine is a quad cab 4wd. I also have an ATC cap on mine. I agree with HEMI HFE on the mileage difference. The 8 speed does a pretty good job of taking up the difference. I average around 21 mpg overall. I am a professional Hunting and Fishing guide and when pulling my boat the mileage drops considerably but I dont have to pull it far as I live on the water. The 3.6L is a gem of a motor and has plenty of power for my 4000 lb boat. The engine is a bit weight sensitive so if your adding say over a 1000 lbs in the bed your going to see/feel a performance difference not so much that it seems to strain the motor, just doesnt have quite the pep and the mileage drops a bit..... pulling my baot I get about 14mpg. P.S. have not had a minutes trouble out of the the truck ...it is all and more than I expected and I'm a die hard FORD kinda guy. Have had two recalls ...the software on Uconnect and now something to do with the airbags. Good luck!
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