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I own both a 2000 Honda Insight and a 2003 Jetta. So I can say this for a fact. The Insight can get 100mpg if driven slow. At 50-65mph the Insight will get 60+mpg. I normally drive around 80-85mph and still get 58+mpg.
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What is so sad is that the early Passat TDI can get close to 100 mpg (90+ to date, but the "ton" still eludes me) when driven like an Insight trying for 100. At 50 MPH the Passat gets over 75 MPG. 60 MPH returns 60 MPG. 70 MPH is about 50 MPG. I've not spent enough continuous distance at 80+ to make a determination of consumption rate.
Is your 58+ MPG at 80~85 MPH based on the optimistic (not my term, that is from other Insight owners) on board display?
What is even sadder is that the TDI can do this on biodiesel. The gasoline powered vehicles would need to maintain 200 MPG to approach the net emissions per mile of a my 3400 lb., five passenger capacity 53 MPG (lifetime, not instantaneous) B100 powered Passat. (Yeah, I'm counting "net" and not tailpipe only. Yes, I'm also considering the CO2 that the US EPA doesn't.)
There are two steps needed to make the current hybrids total net emissions lower than a biodiesel powered TDI:
1) hook onto The TDI's trailer hitch
2) leave the hybrid switched off and let the TDI tow it.