Hope I can ask a question here without hijacking the thread.

I'm planning to buy an '07 AWD FEH (my first new car), and trying to make a decision on the $2k nav system option. I don't feel the need for the GPS or upgraded audio, but I'm wondering if the "Hybrid Energy" functions would justify the cost. Or could I get most of that functionality with the much less costly ScanGauge? I'd like to try some of the hypermiler techniques mentioned in this forum and just wonder if the nav system is required for that.

Thanks for any advice.

Don