As you probably know Honda did not make many Insights so I was unable to locate one locally and had to purchase one from another state and shipped home. The car has performed as expected which means giving up a few creature comforts such as ride quality and a little more road noise and gaining incredible mileage. If you drive this car like any other you can easily obtain the EPA estimates of 60 mpg. However, applying the hypermiling techniques you can easily achieve 80, 90 and yes, 100 MPG. I am averaging over 800 miles between fill ups of my 10 gallon gas tank. For ultimate MPG you need the 5 speed because the manual achieves better mileage than the auto due to operation of lean burn.
The styling. It still looks great after almost 10 years. The mileage is incredible. The only way to get better mileage in an automobile would be a plug-in 2 mode hybrid or pure electric vehicle.
The form & function of the Insight is designed as required to obtain incredible mileage. The only improvements I would personally make would be a center arm rest and to place the emergency brake between the driver door and driver's seat to allow for better center storage & cup holders.
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