Get a cold air intake, for the bonnie. My milage shot up on the freeway, I hit the 40 MPG mark, and so did smellbird I'm sheilding mine right now.... Stupid JBweld won't be ready till the morning....
An air filter every month will cost atleast $10 a month. You're airfilter shouldn't need to be replaced that much, even with your driving. You're spending more then you're saving.
Get new o2'* for both as well.
Change the way you drive. Take roads with less lights, so you don't have to accelerate that much. Move to a better local (300 miles a day isn't good for you, the car, or environment).
'06 Vee Dub GTI 2 door Tornado Red
- 2.0 Turbocharged, Intercooled, Direct Injected, 6 Speed DSG, Underbody Aero, 17" Classix
- Moonroof, Bi-Xenon headlamps, Interlagos Plaid Sport Seats, 6 Disc In-dash, iPod integration, GTI Monster Mats (winter)
'93 Bonneville SE Purple Pearl H4U package - picked up June 23, 2003, Traded-in June 28, 2007...