Yeah, that'll be the fun part. I'm estimating 12mpg for just over 1,000 miles at 3.40 a gallon so 1000/12*3.4=283 bucks. The good news is that I found a 1971 HO72 third member ratioed at 4.11 and it just shipped out today (from Colorado) so it'll be waiting for me when I get home. That'll help with mileage after the fact. :-)