Hey, this thing CAN get good MPG on the Interstate ...

[firsthonda]

Originally Posted by Cobb

Blocking the grill and some lowering will allow you to cruse at 70 and break 52mpg.

Id like to experiment with grill blocking for the winter. What portions of the upper and lower grill do you block?

Anyway, back on topic, I typically get between 48-52 MPG on the highway; without really trying.

[Cobb]

I have it completely blocked and added a bottle of water wetter.


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[Moviemike]

Originally Posted by hawaiidani

Prior to a 200 miles roundtrip to Dickinson, ND from Bismarck, ND the car showed about 58 mpg- appr 45 miles of driving in town hills/ downhills and coasting as much as I could.. That 58ish went down to about 53 by the time we managed the first half of our trip (100miles there). I used the cruise at 68-70mph and let it fight the hills (most is half-3/4 mile long steady uphills at 4-5% grade). On the way back (losing 800 feet elevation) we drove into headwind and the gauge went further down to 49 mpg. I know I'm able to bring it back above 50 by the time this tank empties.. This car with it's tiny engine can't really handle the 70mph with cruise control when the trip includes uphills. After the first fill up a week ago the computer indicated about 51mpg for 450 miles but I managed to fill only 9.3 gallons of gas only in the car and that's exactly 48.9mpg (including another 200miles roundtrip to and from Dickinson, ND from Bismarck ND with occasional heavy winds..
I sure am satisfied with this car so far but I would be curious what would a Prius' computer show (or me calculate) after the same trips..

I suspect the Prius calculated mpg would be a little lower. I think this because the Prius is designed to get its best mpg's at low speeds - 10 -20 mph. Our I2's do best in the low 30's to high 40's mph. Also you'll feel safer with the I2's better handling.

I get similar highway mpg as you've described above. I think wind made a big mpg difference on your trip above. A tail wind gave you a falsely high number, the head wind falsely low. The calculated 48.9 for the tankfull is my "real" number. BTW the car computer averages just under 3mpg optimistic than a "real" calculated mpg figure.

FYI You can see some of the trends in mpg numbers at my Fuelly record at Blue Bird (Honda Insight) | Fuelly What the record calls "City" is mostly hilly rural/suburban driving in the 30-50 mph range. "Highway" is about half 2 lane roads at around 60 mph and half 4 lane highways at 70 mph.