I recently bought a 2000 Dodge Durango with a 4.7L engine with about 120,000 kms (75,000 miles). Just bought a K&N cold air intake kit. I have gone on one long distance highway trip with it and got about 18mpg with mostly driving in the mountains, which I am happy with. I am averaging about 10 mpg in city driving, which I'm not happy with. This can't be normal, if the 4.7 gets 10mpg what does the 5.2 or 5.9 get?! I've been trying to get some help from the local Dodge dealerships, but they are reluctant to help. I realize I didn't buy a 4 cylinder but I expected more than 10mpg. When I bought it I got a local shop to check the codes and they said that nothing came up and also got an alignment. Any ideas would be appreciated.