I would advise AGAINST that indy thing. IF it ever comes to fruition, 25k is a low number. After you buy the kit, you get to buy all the internals, and then assemble. Ran some quick numbers, just did a screen shot. 3k is a bit high for an Insight if you sold your truck, but wanted to make sure I wasn't being too biased on the G1. I know the fun of taking an inefficient vehicle, and making it fuel efficient, so that journey is always a blast! The only reason I even say otherwise, is that very rarely do my modifications pay for themselves. You said 140 miles per day, I inferred 5 days a week. I can send you the Excel sheet, but just a quick write up on my phone.
*Note the Insight calculations are for 50 MPG, not the easily attainable 60-70, or modified 70+. But I'd rather see you mod the truck!