Woud be 1/2 of 14.7 + 1/2 of 9.8 (E85 Stoich) / 14.7. So 0.83 or 17% extra injector room (I know, I'm being **** ).

You are correct - I have not gotten a CEL yet. In fact, I've run up to a 70/30 blend and not gotten a CEL (23% extra injector room). It started to get a bit tougher to cold start when temps were below 45 in the mornings, but nothing drastic. It took an extra second of cranking to catch, and then the RPMs were really low for another second or 2 till the engine really caught and idled properly. Also took a bit longer to warm up to operating temp something I also expected since E85 burns colder than gasoline.

Besides those minute things, I haven't noticed anything different when running even the 70/30 mixture. Of course, my MPG took a hit, but that's to be expected.

Next fill-up, I'm going to go for an 80/20 mix.

Random thought - I know the guy that wrote most of that wikipedia article you linked. He runs a Subaru WRX on E85 here in Colorado.

 

What are the odds that it would be able to handle straight E-85? Maybe I'll wait until I'm on fumes and put a couple of gallons in and see how it does-- unless there's a compelling reason not to (seal or engine damage).

 

I have been wondering exactly the same thing, especially when it ran 70% without problem.

 

I use 87....I'm getting 13-14mph around the city and around 15.5 on the highway but thats going about 75-80 mph, prob could be a little better if i slowed down....around me there is a huge difference between 87 to 89 to 93....like .30 difference! crazy if you ask me.

 

Regular (non Eth) in the Ram.

You're not saving a dime buying the ethanol mixed gas. Ethanol mix reduces your MPG up to 30%.

I own 3 Daimler Chrysler products. All of them get better mileage out of the Regular.

My 5.9L gets 14-15 on premium, 12-13 on Reg, 09-10 on 10% eth.
My I6 XJ gets 19-20 on premium, 16-17 on Reg, 12-13 on 10% eth.
My I4 TJ gets 21-22 on premium, 18-19 on Reg, 15-16 on 10% eth.

These numbers were derived from numerous tanks of each type from 3 of the major gas chains here in my area. BP, Shell and QuikTrip.

 

87 No power get 10-11mpg
89 10% ethanol get 7-8mpg
91 13-14.5mpg
93 14.5-18mpg

I drive on hilly curvy roads and the truck is also used as a emergency responce so it gets the cobs blown out when responding.

 

Have a 98 5.2L. I run 87 octane with no issues. Get about 13 around town, 15 on highway. My owners manual actually says not to use premium, but not sure why.

 

Chrysler's official advice on why some premium gasoline is not always good
(but premium with high DI number is good)

http://dodgeram.info/tsb/1997/14-08-97.htm

 

This is what I have to say about that Chrysler BULL****!!! Spark knock is due to
1. Too high compression and not running enough octain in your fuel. (like a 10:5.1 engine and your runing 87 in it instead of 93)

2. Your timing is too far advanced

3. The engine was got too much carbon on the tops of the pistons due to running poor quality fuel. (this agin will raise your compression)

4. You have had your heads milled and put them back on (this will raise compression)

So who the hell is Chrysler trying to bull****?

That as bad as Chevrolet in the mid to late 80's claiming the the Pickups with side mounted saddle tanks will never pose a safety threat. I'm sorry you mount two 18-22gal gas tanks on the out side of the frame then the truck get broad sided the truck instantly become a rageing inferno and the driver gets BBQed.

 

I run either 91 or 93 octane, depending on what the gas station offers. I have never experienced any knocking and the truck runs very smoothly. To me, it's a minimal expense to play it safe and pay for the higher grade fuel. It did suck, however, when high octane was costing $4.30 a gallon, now it's back to $3.60 around here. My MPGs still suck as usual though. I am getting 11-12 city, and 14-15 on the highway. This is why I want 33/12.5/17 tires now, the 285s have not yielded me anything worth bragging about compared to the 35" tires besides a smoother and safer ride.