Here's what I've done: (Not really mods, just tweaks)
- Removed roof rack crossbars. I do alot of highway driving and this helps a little.<
- Installed ScanGuage. I don't have the Nav system so this helps me see what's going on and improves my driving for max efficiency.<
- Inflated tires to 44PSI. Lots of debate on this, so only inflate them as much as you are comfortable with.<
- Park in shade whenever possible in the warmer months. This reduces (or eliminates) the load on the AC when I get in to drive away. I also use a windshield shade when I there's no shade to park in and I have vent visors installed so I can leave the windows cracked and not worry about the rain.<
- Shift to 'L' when in town. This lets the ICE shut down when below 40MPH<
What it all boils down to is that your driving style has the biggest impact on FE, so for me, the biggest gain has been from using the ScanGauge to monitor instantaneous MPG.
BTW, welcome to the forum!