Welcome! A G1 Insight will easily double your mileage while keeping the miles odd your family truckster!
If a no go (always nice to have a back up car, personally), then start going through here:
65+ Vehicle modifications for better fuel economy - EcoModder.com
First I found one or two...the more I looked, the more I found. I imagine your technique is decent now, but you can learn more here:
100+ Hypermiling / ecodriving tips & tactics for better mpg - EcoModder.com
Again, at first many seem crazy- next you know, 5% seems crazy...then...you may end up thinking about a home built electric vehicle to charge at work! Either way, keep us posted, and welcome aboard