Wifey had a Nissan Quest. We took it on vacation and the thing was getting like 15 mpg. I asked her if she noticed the shitty mpg she was getting because it used to get like 20 mpg. She just shrugged. At the hotel, I took the air filter out and there was so much shit in there it was unbelievable. Bugs, sand, pebbles, dirt, fucking full of pine needles! Thing was so clogged it was crazy. Hit the auto zone and changed the filter, got 22 mpg rest of the trip. I keep an eye on those filters now.