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I've switched back and forth a couple of times. I run it as close to empty as I can and then fill the tank with the other fuel. As a precaution, I don't go WOT until I've cycled through a full tank.

A better approach would be to keep a couple of empty plastic five gallon drums in the trunk and when you get low on gas, fill the drums instead of the tank and then keep driving until you run out or get down to where the range displayed shows as "--" and then fill the tank from the drums.
That's probably the best way to do it without a content analyzer. On mine, I'll run it until it's as empty as I think I'm going to get it, then I put E100 in it to balance it out, and my content analyzer still reads E75ish, I have to keep cycling to get to E85, takes about another 1/2 tank of E100. Even draining the car from the return into a bucket until the car dies leaves 5% gas in there.
 

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I know many other non-R35's use Meth injection. I wondered about this before I even bought my car so I did some research on it.

At the time there was NO major tuning house that used it on the R35. That, I felt, was an important statistic.
With E85 being more and more available, theres not really a point to running meth/water injection. It serves 2 main purposes; 1. Cool air charge, 2. Increase octane (adding water obviously increases the fuels resistance to burn). These cars have sufficient intercoolers, and as are the aftermarket ones so point 1 is kinda moot, so the main benefit would be increased octane. E85 takes care of both, although it doesn't cool the air charge it does lower combustion chamber temps which is obviously related to it's higher octane. No point in meth on a ethanol fuel car IMO.

It helps to remember the origin of meth injection, primarily used on airplanes in WWI to increase power and lower temps, keeping in mind those are non intercooled planes running on less than ideal fuel by today's standards.
 

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This is a quote I made from our local forum; may be of some help:

[QUOTE='Trust';78763]I'm sure all you E-thugs know this, but I was doing a little research (after briefly talking to Kong yesterday about this) and E85 has seasonal blend changes that would affect it's stoich, here is some info:

Key (Ethanol/Hydrocarbons): Class 1 (85/15) is the summer blend; Class 2 (80/20) is the transition blend utilized in the spring and fall; and Class 3 (75/25) is the winter blend.

Chart from the National Ethanol Vehicle Coalition.



I'm not sure how much this would affect stoich and tuning because the fuel is so cool (temp) and such a high octane. Worth mentioning I think, and I'm sure Rob has much more input than I.

Some distributors use the following:

Season Minimum With Blend
Spring (March-May) 74% 76.6%
Summer (Jun-Aug) 79% 81.1%
Fall (Sept-Nov) 74% 76.6%
Winter (Dec-Feb) 70% 73%

So in the winter it can be as low as E70.[/QUOTE]

Luckily our main E station is owned by an enthusiast so he makes sure it's always at least E85, and E98.
 
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