Volant is the best one I have found yet, hence why it is under my hood. CAI isn't going to do too much for a MPG increase but it will help. A good exhaust system and a tuner can help in gaining better MPG also.
If you want a real CAI I have the Mopar intake tube for sale - in classifieds. I removed it from my 2011 and replaced it with a carbon fiber one. Strap on a filter and you're off. I was asking $225 shipped but I'm open to offers.