There's an old saying about whether the fish are biting or not that I use all the time in other regards and I'll say it here. You don't know if you don't go. Fred asked, otherwise I would've kept quiet. I sure don't give a hoot whether Y'all try it or not. But, On my 91 YJ 4.0 the best mileage check I ever got with mostly Hwy driving was 21 MPG. The worst was 18. I checked the CJ several times since I've owned it and the best I ever got (before adding acetone) was 17mpg. I was relitively happy with that after reading on this forum what others got in their Jeeps. I seem to be getting better milage with the CJ's 258 with acetone than the YJ's 4.0 without. I was pleasently suprised. I intend to add some to the YJ next time I fill it up, it has been pretty consistent on mileage over the last year and since it never goes off road,it will be easier to ge a good "city" check. I may post my "crap" findings here later. Just for fun! It may be a while though 'cause I don't drive it much these days. <img src="/forums/images/graemlins/cheers.gif" alt="" />