CARBOB energy content. - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 03-23-2007, 09:07 AM   #1
Registered Member
 
omgwtfbyobbq's Avatar
 
Join Date: Jul 2006
Posts: 1,516
Country: United States
CARBOB energy content.

Apparently, CA uses a different oxygenate blend than the rest of the nation uses, as well as cutting everything with 6% ethanol. Does anyone happen to know what the difference in energy content between CARBOB and BOB is? I'm curious because I stumbled on something The Toecutter posted.

Quote:
Wrong. It was pretty shabby. Because, driven just as hard, Nevada through Utah, then on to Denver, fuel consumption suddenly shot down, to 43 MPGs. Just peetering around Denver, for a week, visiting people I know, I saw fuel consumption numbers, on the Prius, I've never seen, in California. Urban driving, I saw numbers in the readout, over 12 miles per gallon higher, than anything I've ever experienced, in California. Driving this car, exactly the same as I do, in California, the Prius was averaged 12 miles to the gallon better, in urban Denver, than it does, in urban Los Angeles.

~ Long drive, 13 hours and 40 minutes home, exactly same thing: Denver, through Utah, corner of Arizona, to Nevada, the Prius got over 43 miles to the gallon. Last fuel stop, topping off in Baker, California, heading westbound, to Los Angeles, driving this thing just as hard as ever, fuel consumption inexplicably crumbed, to 36 MPGs. Some reason, mere act of purchasing gasoline formulated, for California, cost 5 MPGs.
__________________

__________________
Quote:
Originally Posted by FormulaTwo
I think if i could get that type of FE i would have no problem driving a dildo shaped car.
omgwtfbyobbq is offline   Reply With Quote
Old 03-23-2007, 01:21 PM   #2
Registered Member
 
bones33's Avatar
 
Join Date: Aug 2012
Posts: 180
Country: United States
I've noticed similar effects with CA gas. My old mazda truck always ran stronger and got better FE with non-CA gas. Motorcycle all of a sudden was running really rich when I moved back to WA. Whatever oxygenates they use cause carbureted engines to run a little leaner, that's why motorcycle manufacturers have different carb specs for california models. I definitely noticed that CA gas produced less power, requiring more fuel to go the same distance.
Sorry, no help on the particulars but I seem to remember more benzene.
__________________

bones33 is offline   Reply With Quote
Old 03-23-2007, 01:59 PM   #3
Registered Member
 
mrmad's Avatar
 
Join Date: Mar 2007
Posts: 386
Country: United States
Wow, I guess that means the 47.4mpg on my last tank is really 52.4mpg? That would put me in the top ten, wohoo!

While there certainly could be a difference in mileage between CA gas and 49 state gas, the post Toecutter made on his Prius indicated he was getting much better mileage in Denver. I wonder if this could have something to do with the altitude and how the ECU in the Prius handles the difference in pressure? If the gas was the same, you'd almost think the car would get worse mileage at high altitude, but who knows?

I'll try to do some research on this, but I do know that CA changes gas formula from winter to summer. It'd be interesting to know the difference between these two types as well.
mrmad is offline   Reply With Quote
Old 03-24-2007, 08:29 AM   #4
Supporting Member
 
Hockey4mnhs's Avatar
 
Join Date: Dec 2006
Posts: 760
Country: United States
When do they change from summer gas to winter gas. is there a spicific month or is it temp related
__________________
Hockey4mnhs is offline   Reply With Quote
Old 03-24-2007, 09:12 AM   #5
Registered Member
 
zpiloto's Avatar
 
Join Date: Mar 2006
Posts: 1,225
Country: United States
I thought that the energy content would be the same as any other E10 blend and that the main difference was that in CA they were using a low sulfur content gas. Also didn't all gas to low sulfur this year along with diesel?
zpiloto is offline   Reply With Quote
Old 03-24-2007, 08:12 PM   #6
Registered Member
 
Join Date: Mar 2007
Posts: 1,138
Country: United States
Quote:
Originally Posted by Hockey4mnhs View Post
When do they change from summer gas to winter gas. is there a spicific month or is it temp related
Specific month.

It would seem to me that being at high altitude would increase your gas mileage. Less wind resistance, lower pumping losses, etc...

And for the OP, I cannot think of any reason for CA gas to have a much lower energy content. No reason at all. The gas in Denver should have been an oxygenated winter blend, so it's not even a conventional vs rfg thing...
__________________
Bill in Houston is offline   Reply With Quote
Old 03-24-2007, 08:45 PM   #7
Supporting Member
 
cfg83's Avatar
 
Join Date: Sep 2006
Posts: 1,779
Country: United States
Hello -

There was a fellow here by the name of koinos :

Hi, another Paseo from Long Beach CA
http://www.gassavers.org/showpost.ph...00&postcount=1
Quote:
... As I am working at the refinery as an engineer I have practical knowledge and experience about fuels ...
He only posted a few times, so maybe he is gone. But if he is lurking, then I'll bet he would know.

CarloSW2
__________________
Old School SW2 EPA ... New School Civic EPA :

What's your EPA MPG? http://www.fueleconomy.gov/feg/calculatorSelectYear.jsp
cfg83 is offline   Reply With Quote
Old 03-25-2007, 12:00 AM   #8
Registered Member
 
VetteOwner's Avatar
 
Join Date: Mar 2007
Posts: 1,546
Country: United States
Quote:
Originally Posted by Bill in Houston View Post
Specific month.

It would seem to me that being at high altitude would increase your gas mileage. Less wind resistance, lower pumping losses, etc...

And for the OP, I cannot think of any reason for CA gas to have a much lower energy content. No reason at all. The gas in Denver should have been an oxygenated winter blend, so it's not even a conventional vs rfg thing...
dont forget about less power. My family and i took a vaction to colorado in elevations of 7000+ feet above sealevel while we live in a measily 600 feet above sealevel. our van (96 Aerostar)seemed to be a noticeable difference(huge one might say) in power. so it may not get better MPG because you will have to press the pedal harder to get the same force out...i would think.
VetteOwner is offline   Reply With Quote
Old 03-25-2007, 07:51 AM   #9
ELF
Registered Member
 
ELF's Avatar
 
Join Date: Jan 2007
Posts: 245
Country: United States
California banned mtbe starting 1/1/04 as a oxygenate, now they use ethanol, supposed to be 5.7%. but can be from 4% to 9% depending on the fuel supplier.
zpiloto is right they recently switched to low sulfer, but I think there is more to it than that.
Carbob has limits on lots other chemicals like benzene, xylene,Toluene,Ethyl Benzene,Nhexane,cyclohexane to name a few. adding more or less of some of these could change how much energy the fuel has.
I'm not sure the oxygenated gas is doing what its supposed to do though.
Carbob will be changing the max. oxy % on 7/1/07, the max oxy content is going from 0.25 to 0.009
__________________
ELF is offline   Reply With Quote
Old 03-25-2007, 09:12 AM   #10
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
Quote:
Originally Posted by VetteOwner View Post
dont forget about less power. so it may not get better MPG because you will have to press the pedal harder to get the same force out...i would think.
That would theoretically also improve FE due to reduced throttle (pumping) losses Bill was referring to (assuming you didn't also use lower gears more).

Generally speaking, cars driven at higher altitudes should get better mileage than cars at lower altitudes (all else being equal).
__________________

MetroMPG is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Looks like the price you entered for a litre of gas is unrealistic. winstona Fuelly Web Support and Community News 6 05-12-2013 11:26 AM
Need help - my trip odometer was reset Keen4Green Fuelly Web Support and Community News 7 09-27-2010 07:27 AM
Fuelly Android App - eehokie Fuelly Web Support and Community News 2 07-14-2010 09:59 PM
Civic VX - $2000 tomauto For Sale 4 09-10-2006 10:57 AM
Gaslog suggestion SVOboy General Discussion (Off-Topic) 1 04-29-2006 09:35 AM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 08:54 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.