Guesstimate on Highway mileage for Gen II Prius

No need to guesstimate. Here are bob's charts. They show the GenI (NHW11), GenII (NHW20), and GenIII (ZVW30) with mpg. vs. speed.

A 2009 @ 70mph on average will net 48mpg on E10. Closer to 50mpg to 51mpg on E0. The GenIII has a larger engine and is more equipped for highway driving. From the charts above 50mpg on E10.

Bob's hard work available throughout Priuschat.com below:

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Overlay is hard because it means mixing spreadsheets to do it right or fiddling with scales. Let me put them together and then flip between them until I can take time to do it right:


The efficiency curve is for the 1.6L NHW11 and has all of the NHW20 low speed data points. I also have some high speed NHW20 data points in this chart:

Take care with some of the data that was captured in high temperatures.

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Read more: http://priuschat.com/threads/updated-mpg-vs-mph-chart.64296/#ixzz2ZMv3h0C3 ​

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As you can see from Bob's charts, the MPG should be about 46 to 48.

There are many factors that affect MPG. Remember that your mileage will vary. The Prius is very efficient on the highway even at 70 MPH. One thing that must be remembered is that mileage will vary depending on conditions. Summer time versus Winter time will be different. Generally Winter time is lower. There are also other factors that may cause MPG to vary.

It would be very fair to say that the Prius will beat your Chev Aveo hands down concerning MPG.

The Gen II Prius (2004-2009) is rated by the EPA at 48 City, 45 Highway. I believe the Aveo's rating to be considerably lower.

Compare Side-by-Side Prius Rating

Fuel Economy of the 2006 Chevrolet Aveo 5 Aveo Rating

Ron

 

No ethanol??? Good luck with that.

 

Actually, there are 52 locations listed on the puregas website in Nebraska.

Ethanol-free gas stations in the U.S. and Canada

And 22 locations in WV

Ethanol-free gas stations in the U.S. and Canada

 

Unfortunately I'm in neither of those locations.

 

? Ho hum...

Regardless, if you are interested in buying E0 gas, according to puregas.org there is a supplier 16 miles from the location in your profile.

Yahoo! Maps, Driving Directions, and Traffic

pure-gas.org : display a station

Ron

 

Any E-0 savings will be more than offset by the much higher price. I actually located it (north of Atlanta)and instead of $3.48 per gallon it was around $4.50.

 

My Gen 2 averaged 46 MPG at 61 MPH. Just cruising, 55 MPG but you always have some other traffic.
Interstate will help some, I had towns and stops signs, if you can keep the speed down.
You will pay less for E10, as the MPG does not go up as fast as the price does for E0. (in MS)

 

Figure on 44-46 MPG and worse if you exceed 70 MPG.
E0 we generally feel is good for 2-3% boost (eg ;+1 MPG).

 

3% of $3.50 is about 10 Cents. So getting puregas for a Prius you lose 90 cents a gallon getting it for 4.50 a gallon.
E10 your milage drops 3%, e5 losses vs. E0 are in the noise with a Prius.
False Economy for the driver of a Prius running this expensive puregas. Puregas makes shitloads of money from the scare. If puregas is less than 3% more expensive than E10, you cheaper off using pure gas. At more than 25% more it is a scam.
I Run e85 and use 30% more fuel! but save 25% on fuel cost as it is tax free in nearby France where I get my fuel. E85 is $4.50 a gallon in France vs. E5/e10 for around $8 a gallon in Germany to put things into perspective.


Marko

 

The Prius is designed to run on regular fuel (87 octane). Am I correct to understand you are running E85 in your Prius? If that is correct, would you be so kind as to post how long you have been doing this (months, years, etc.).

 

There are tons of folks here running e85 in a Prius. Mostly gen2.
You can use up to 70% ethanol in summer and about 40% in winter without any changes to the car. To run pure e85 summer and winter you need a piggyback ECU to extend injection duration by 30% to compensate for the lower energy content per volume. Below 15C it also adds an other 60% to help cold start as ethanol has a very low vapor pressure. The engine essentially starts on the petrol component at freezing temps.

I have my prius since jan this year and use it on e85 sine February for ~10000 Miles so far. They Run Really well and strong on e85. I can maintain 180 km/h on the Autobahn at 75% trottle. The only reason i use it is fuel cost. Per mile I Save 25% on fuel.

Marko


iPad ? - now Free

 

Interesting information. Can you post links to the piggyback ECU you mentioned?

 

That's what i use :
http://www.ecobox.günstig-tanken.eu

I paid 95€ on ebay. In the us they are sold as e85 conversion kits.

Thechnically the Prius would Run Fine without due to the wideband lambda sensor. Due to OBD Standards it throws a lean Run Code Past ~ 26% fuel trim.
I needs about 30% for pure e85. Winter cold start enrichment is insufficient too in colder climates. The kit fixes that.
It is only economical to run if e85 costs at least 30% less than gas.
I pay ~45% less per liter or 25% per mile.



iPad ? - now Free

 

I understand what you are saying. This has been discussed many times here on Prius Chat. One down fall here in the states is that the models sold here in the United States have a different fuel system than the one's being sold where you are. If you still have this car after running E85 for several years and or 100K or more, it would be interesting to know if you had to do any repairs to the fuel system.

Prius Conversion to E85 Ethanol? | PriusChat

Best of luck to you, and thanks for the info.

 

The headliner is a German Prius gen2 driver. He reported 120000km on 30 to 70% e85 in gas mix , no piggy back, in 3 years without any issues.


iPad ? - now Free

 

That may be very well true, however the model's that are being sold here in the United States are different from the model's sold elsewhere. There is a lot of discussion on this subject. It is not recommended by the manufacturer, therefore it is up to the owner of said vehicle to perform any modifications at their own risk and expense.

When Toyota manufactures a flex fuel type Prius, I will have no problems using that fuel (E85). Until then, I for one will stick with what is recommended, regardless if the cost is higher on a per tank basis. There has to be a reason why the flex fuel type vehicles being made today have different fuel system components that it's non flex fuel counterparts.

I admire you for your efforts, and I wish you the best of luck.

 

Anyhow... back to the question that OP has...
If you have never driven a prius and drive it like you would any other car (ie. using cruise, ac, not mindful of acceleration pressure etc) Expect to get high 30's, low 40mpg average imo. And that is if you are driving solo with no added weight. Expect this, and you wont be disappointed if that is what you actually get, and pleased if you get more
Now, after you become infatuated with the prius's capability of stretching your miles per gallon as far as possible, you will learn how to get more. I am getting better with every tank (last tank was 51.5mpg according to fuelly) and am now experimenting with drafting behind semis lol. If I get into a sweet spot I can go 70mph while getting 60mpg for a couple miles at a time. Only downside is im risking getting a rock to the windshield :/