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Friday
Aug212009

New MPG record

Today I set a new "round trip" mpg record.  I'm up in Winter Harbor, Maine on vacation and the roads here have low speed limits (25-45 mph) without much traffic and not one stoplight.  There are some hills but there are also good stretches of road without much grade.

At home my best mileage for a round trip, 17 mile drive is about 56 mpg.  I picked that route to maximize flat stretches of road.  It does have one stretch where the speed limit is 55 so the engine comes on and I lose mpgs there.  Also I drive that route at night to minimize traffic and the car's lights ultimately steal some mpg because the battery has to be charged more often.

Today, on a 16.1 mile drive around Schoodic Point, I managed 63.6 mpg!  I'm quite pleased with that. My battery state of charge was initially about 60% and was at about 35% when I completed the loop, so I will pay for that later in reduced mpg.

I used the "pulse and glide" technique, whereby you accelerate using the engine to your top speed, then let off the accelerator and go into EV mode for as long as you can until you are going too slow.  This minimizes the time the engine is on and gets you better mileage than simply using moderate throttle pressure to maintain the same average speed.

Perhaps my car has broken in more since I drove the 600 miles up to Maine, and is getting the reputed better mileage after several thousand miles (I'm at about 2400 miles now); more likely the roads are just more conducive to good mpg here.

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Reader Comments (7)

My best in my ffh was 72.6 for a quick trip of only about 3 miles in traffic.

August 22, 2009 | Unregistered Commentertommy

You really need to do a round trip to equalize the hills, wind, etc. Also, to be totally fair you should start and end with the same or higher battery state of charge (which I did not on my trip).

August 22, 2009 | Registered CommenterBill Wood

I believe my best was 70.1 on a one way trip between home and work.

August 24, 2009 | Unregistered CommenterKevin

Hi,
You've got some terrific stuff here on your blog. I too have a loop that I use for mileage runs. Mine is just over 10 miles long and is all suburban type roads with speed limits 30 - 40. There are hills and I can't avoid those outside of Boston. Also, don't know if they matter that much or not. My top mileage on this loop so far is 79.9 so 80 mpg is in reach. I too returned with a lower battery charge then when I started, so this does plump the figure a bit. Although for 10 miles this effect is somewhat minimized.
Fusion Hypermiler (Richard)

October 2, 2009 | Unregistered CommenterRichard

Wow, 80 mpg in my dreams! Impressive. The hills around Boston are nice rolling ones and the speed limit is just right.

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