Everyone in the US has. It's all we can get around here.
I have no problem with the 2002 or the E28 with 10% ethanol fuel. The
thing about ethanol is that it's a pretty good detonation prevention
agent. It's not as hazardous as lead or MTBE, both of which are stuff
you really don't want around you.
The other thing about ethanol is that it's a great solvent, and it will
dissolve gums and varnishes that precipitate out of regular gasoline.
This is a good thing in the long term, but in the short term it can mean
a lot of old gunk in your gas tank goes into solution and may clog up
the fuel filter and the backflow valve... or even worse, the fuel
injectors and the pressure regulator. A 10% mix isn't too bad, though,
and won't do too much of that.
There are fuel lines made from rubbers which aren't compatible with
ethanol out there, but as far as I know anything BMW has made since
the seventies should be okay with 10%, although it might not be good
at all with 85%. If you want to run 85% you will need to change fuel
lines on some older cars.
Some folks have claimed that because the optimal mixture ratio for
the new 10% ethanol fuel is a little different that if you have a
car with an older open-loop fuel system you may have to rejet your
carbs. Personally I haven't noticed a problem with the 2002.
"C'est un Nagra. C'est suisse, et tres, tres precis."
Thanks for the replies.
Meanwhile, I've been told that the current unleaded 95 also contains 6% of
Wrt the margins the designeers usually take, I'm feeling quite comfortable
on this point.
However to produce ethanol is more expensive than regular fuel and the yield
is a little bit lower.
Where's the cost saving ???
The two gas stations near home have abaldonned the regular 95. I'll try the
98 and compare. If I try to believe the intensive advertisement they do, the
mileage would be extended (?). If so, I'll switch to it, otherwise, I'll be
compelled to use 95E10 :-)
firstname.lastname@example.org (Scott Dorsey) wrote in
are you perhaps meaning 85 octane as I have not seen 95 in a verrrry
long time outside the airport gate. If so you need to use the next step
up if it is ethanol. here that would be 87. the ethanol dosn`t work well
below 87 because that is reg gas blended with ethanol at 10%. anything
below that is using some crap gas blend to get 85 (or less than 10%
blend) and many cars and bikes will not run fer crap on it.
as to the saving concept, it is energy positive to make ethanol.
anything else you see is not correct, or old information. the processes
used now are much more efficient now than before. last figures I saw it
was about 120% so there is a net gain along with removing the nasty NTBE
from the mix. KB
I believe he is referring to the European octane rating which is roughly 5
points above the US (R+M)/2 average "pump" octane. So his 95 = US 90 and
his "superpremium" 98 = US premium of 93.
BTW, 85 octane (US) is normally only found at higher elevations where the
octane requirement is a bit lower.
They just introduced the E10 that is 95 containing 4% more ethanol and
roughly suppressed the regular 95 from almost all the gas stations
About 40% of the cars are confirmed by the manufacturers, not to be
compatible with the E10 !
A complete mess from the government since people will be compelled to buy
98RON for a while.
I googled a bit and found this site providing generous explanations and
quite convincing figures.
The conclusion is that it doesn't encourage to use the E10 as a replacement
of the 95RON.
Have a look on para. 9 concerning the manufacturers' opinions. Although it
addresses more than 10% between 9 & 10.1, the gap is small.
This table extrtacted from para. 4 speaks by itself.
Volume % Volume % Energy of 1 gal % Reduction
Ethanol Gasoline of fuel, Btu/gal Compared to Gasoline
0 100.0 114
5.7 94.3 111 834
10.0 90.0 110 200
Assuming that the mileage follows the volumic energy, moving from 6 to 10%,
tends to demonstrate that the mileage is reduced by 1.4 % !
and by 3.3% from 100% gazoline fuel basis.
OTOH the 98 not being the 95, I'm wondering what would be the related
All this isn't dealing with all the other side effects.
Interesting - so I gather that the your "superpremium" 98 will not contain
any ethanol and the 95 will be upped from 6% to 10%. There are still some
areas in the US where one has a choice only between non-ethanol 87 US octane
(= approx. 91 Euro), or E10 rated at 89 (93~94 Euro). In other words, they
are using ethanol primarily to boost the octane rating. Luckily, my 128i
ran well on the 89 E10, although I usually try to burn only US 93.
I purchased a pellet stove a few years ago which would burn corn as well as
wood pellets and used about 20% corn for the first heating season. But with
the mass distribution of E10, the price of corn has now made it much too
expensive to use as a heating fuel - plus storage is a problem as it's tough
to keep the mice away!
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