Most fuel efficient speed (highest MPG)?

[2009Prius]

I have read many threads but haven't come across one that clearly answer this question: at what speed does the Prius achieve the best fuel economy (highest MPG)? Thanks!

[TheForce]

There was a graph somewhere about this. If I remember correctly I think the MPG peaked at around 35MPH. I think the MPG was around 80-90MPG at that speed. Maybe some one here has that graph.

[TheForce]

I think I was wrong unless this is not the right graph. I just remembered the speed was pretty slow and the MPG was pretty high.

http://priuschat.com/forums/fuel-eco...tml#post385271

[Shawn Clark]

So it looks like the peak is around 20 mph or even 25 mph depending on one's interpretation of the temp. effect in the data. From a little over 15 mph through 30 mph it is 100+ mpg with OEM tires at stock pressures.

[bwilson4web]

Originally Posted by 2009Prius

I have read many threads but haven't come across one that clearly answer this question: at what speed does the Prius achieve the best fuel economy (highest MPG)? Thanks!

Questions?

Bob Wilson

[donee]

Hi '09Prius,

A 35/41 mph pulse and glide is good for the high 70's mpg. 53 mph on the level highway with no wind in super highway mode is good for the low 70's mpg.

If traffic would allow, a 20/41 mpg pulse and glide would probably up near 100 mpg.

[tom1l21]

Originally Posted by donee

Hi '09Prius,

A 35/41 mph pulse and glide is good for the high 70's mpg. 53 mph on the level highway with no wind in super highway mode is good for the low 70's mpg.

If traffic would allow, a 20/41 mpg pulse and glide would probably up near 100 mpg.

I don't understand how you get these numbers. I consider myself pretty learned on P+G as well as other things such as slowing to a stop light to catch it on Green etc. The best I can ever acheive over say a 15 min stretch is about 65mpg. My lifetime avg is around 55 and my current tank is averaging 60mpg. I live in an area where it is relatively cool, however, last couple weeks been realy warm mid 80's to lower 90's. How do you acheive such high mpg's? Is it because you live in a completely flat state? Massachusetts is far from that.

Also, my commute is about 1 hour a day through rolling hills.

[Midpack]

Originally Posted by tom1l21

I don't understand how you get these numbers. I consider myself pretty learned on P+G as well as other things such as slowing to a stop light to catch it on Green etc. The best I can ever acheive over say a 15 min stretch is about 65mpg. My lifetime avg is around 55 and my current tank is averaging 60mpg. I live in an area where it is relatively cool, however, last couple weeks been realy warm mid 80's to lower 90's. How do you acheive such high mpg's? Is it because you live in a completely flat state? Massachusetts is far from that.

Also, my commute is about 1 hour a day through rolling hills.

It's not just you, I accelerate slowly, drive the speed limit, keep my tires inflated, keep the windows rolled up and AC off (as much as possible) - and while I get good mileage, I never see the high numbers others post. My Prius mileage averages about 47. I don't understand how they do it...

[bedrock8x]

They drive 10-15 mph below speed limit. 15 @ 25mph, 30 @ 45mph, 50 @65mph.

Originally Posted by Midpack

It's not just you, I accelerate slowly, drive the speed limit, keep my tires inflated, keep the windows rolled up an AC off (as much as possible) - and while I get good mileage, I never see the high numbers others post. My Prius mileage averages about 47. I don't understand how they do it...

[JimboK]

Tom, it takes practice and patience. I'm still refining my technique after 3.5 years.

If you're anywhere near Boston, you might consider contacting PC member Hobbit for a hands-on clinic.