What kind of gas do you use for your prius?

Regular. Premium offers absolutely no advantages amd may, in fact, be detrimental.

 

<div class='quotetop'>QUOTE(lenjack @ Sep 6 2007, 09:05 PM) [snapback]508240[/snapback]</div>

try to find one without ethanol if you can, it hurts mpg

 

I use only E10. I'd rather use a renewable fuel as much as I can. I think using carbon which has been captured from the atmosphere means I am contributing slightly less carbon to the environment. I think this is more important than the number on my display.
I haven't noticed an increase in fuel consumption on E10, maybe if I switch to standard petrol I might.

E10 is 3c per litre cheaper than straight petrol which is due to lower duty on it.

 

<div class='quotetop'>QUOTE(SureValla @ Sep 6 2007, 09:06 PM) [snapback]508242[/snapback]</div>

I always use E10 - because I support renewable fuels - and I still get 55 MPG in my Prius. If that's a sacrifice, I'll take it.

:lol:

 

why does E10 lower the MPG?

 

Regular. 87 octane. I think, but I'm not sure, that it's always E10. I think E10 may be the only kind of regular I can get around here (NY)?

 

<div class='quotetop'>QUOTE(arolf @ Sep 7 2007, 01:20 PM) [snapback]508357[/snapback]</div>

Ethanol has a lower energy density than petrol
Energy density of Ethanol = 24 MJ/litre
Energy density of petrol = 34.6MJ/litre
Energy density of E10 = 28.06MJ/litre
From http://en.wikipedia.org/wiki/Energy_density
I have my doubts about these figures as they indicate ethanol has negative energy when added to petrol??

This may be more acurate

Ethanol = 84,600BTU/Gallon
Petrol = 125,000BTU/Gallon
E10 = 120,900BTU/Gallon
Less than 4% less energy in E10 than in petrol
From http://en.wikipedia.org/wiki/Gasoline

 

The cheapest 87 octane I can find- 64K miles and runs perfect w/o any troubles.