Fueleconomy.gov reports the identical mileage for both.
13city / 18 highway
5speed auto v6 4L, 6 speed auto v8 4.6L
Surely if you are towing anything or pulling hills hte 4.6 might do
better than the 4L again.
The 4.0L used to be a little better on gas, not sure what happened to it...
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