I've been out on the freeway driving the car and it is amazing how much less fuel the engine uses with the extra ignition timing. The MSD distributor that I had before did not have vacuum advance so I was limited to 34 degrees total going down the road. Now with 40+ degrees at cruise speed the fuel consumption is reduced by 30%. That is a big savings in gas. It was using around 40 lbs/hr at 75 mph and now it has dropped below 30 lbs/hr at the same speed. It isn't going to be a fuel economy star but now I should be able to take it somewhere without always having to look for a gas station. If I can get 15 mpg on the freeway I'd be happy. I typically don't drive it more than 30 or 40 miles anyway but maybe if the mpg is better I might take it on longer drives.