Yup, put in my Grand Cherokee too. The best I could do on the eway was almost 16mpg and 11 city. I've done 21mpg on the eway on 87 octane. Could have told you not to use that crap Brad

There was a thing on Discovery the other day about it. Between making it and using it, it's not really better. Maybe just the use in cars part is better, but you have to factor in making it too, so considering it uses more energy to make than you get it sucks. Now if it was a buck a gallon I'd used the hell out of it to make up for the mileage I get. Down side would be filling up every 2-3 days