Join Date: Mar 2006
Location: Helsinki, Finland - on the European side of the Atlantic
I tried 30/70 e85/ 95e10 (that's max. 10% ethanol on the 95 octane gas) mix on my 5.9 ZJ for about 10 full tanks. I saw about a 1-2MPG worse mileage mixed city and highway driving, no other ill- effects. e85 over this side of the ocean is roughly 1€ per litre (that's ~5.2$/ gallon, 95E10 gasoline is ~8$/ gallon), so I did save about 20€ per full tank of gas. Not a whole lot, but with the gas prices over here it adds up to big savings over the year. I stopped using the mix for the winter, may do that again when sprign comes.
Then again, XJ 6- cylinder is completely different engine and as far as I know, it really isn't recommended to use e85 at all, not even when mixing with normal gasoline. ZJ V8 engines I've seen reports and people have been using 'em with up to even 50% e85, but at that high ratios you will see a drop in mileage, reduced power and hard start-ups on cold weather. Over longer period of time I don't know if the the ZJ gasoline system (O- rings and stuff like that) components are ethanol- resistant enough to be ok for 30-50% on the fuel system. Jeep told Finnish authorities all their vehicles '87 and up are ok to run up to 10-20% ethanol-gasoline mix.
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