IMO, the biggest thing I pick up on regarding mileage is the fuel capacity is too low.
I generally will avoid running below the quarter tank level and because of that capacity, I find myself filling it up more often than my other vehicles that get similar mileage.
This, for me, creates the perception of lousy mileage from a comparative standpoint.
For example, my 97 Chev pickup gets about the same mileage but has a 32 gallon tank.
Although filling that one is financially memorable, the longer period of time between fuel stops creates the perception of better mileage than my 4.7 Commander.
It isn't though.....they get very similar mileage numbers.
So, all that being said, I have grown fairly adept at squeezing the most out of the Commander between fuel stops.
I run the tires at 40psi to minimize rolling resistance.....the difference in ride is minimal and the 5psi varience has not shown any evidence of traction loss in rain or snow.....as a aside, the tread life seems to be extended.
I removed the original copper cored plugs at 30k per the manual and they were replaced with Champion iridium.....this was not to improve mileage but to maintain the mileage I do get for longer periods of time. As anticipated, there was no change in mileage and that was OK.
Be it 4.7 or 5.7, they get almost the same mileage......this is were the gang with the
V6's do better around town regarding fuel usage.....we are feeding 287 or just under 350 cubic inches at idle, the V-6 crowd are feeding only 229? inches......that makes a difference when each is light on the go pedal when the light changes too.
I could go on and on as the others members know.......so, just try to stay within these parameters: Tire pressure is quite high on the list.....ever noticed how easy it is to pedal a bicycle immediatly after restoring the tire pressure? Same applies.
Although the Hemi is incredibly strong from a start, you are heaving over 5000 lbs. of vehicle up to speed.......try a more gentle rollout up to speed......this makes a dramitic difference.....it takes lotsa oats to feed the ponies and the gas pedal is nothing more than a fuel valve connected to your foot.
We have all found, regardless of engine, these things get their best mileage below
2000 rpm......keep an eye on the tach......as soon as you get above 2k rpm or about 70mph the gas gauge begins to race the speedometer.
Low restriction intake systems and low restriction exausts will accomplish nothing regarding mileage if you are operating in the lower rpm ranges......the potental airflow increases will only become evident above 4000 rpm, an engine speed that is rarely operated at on a street vehicle......especially one like this....whats the point IMO.
For now, to see what you can get, next time you are on the highway, set the cruise on 65 mph and then reset the average mileage readout......in about twenty miles you will have a readout that is fairly accurate (assuming stock tire size) for what you currently can attain. Don't be surprised to find a stock, Commander pulling down somewhere between 18 and 21 mpg......not bad for something with the aeros of a refrigerator crate.
Now, if you want to depress yourself, next time you fuel up with no highway travels anticipated, reset the av. mileage and be prepared to see 11 to 15 depending on how many lights you sit at and your acceleration habits.
For whatever it is worth, this applies to all vehicles, not just our Commanders......around towning will eat you alive with any large vehicle.
Welcome aboard and congrats on your new to you Commander,
Last edited by robby; 12-25-2011 at 09:16 AM.
Reason: spelling error