Being an engineering oriented guy (Land Surveyor), Dave Pelz's Short Game Bible resonated with me. And, in my excitement I went to a park & GC a couple times and worked with several clubs measuring (with a survey tape) total distance on full shots, 10:30 swings, 9:00 swings and 7:30 swings. I noticed a pretty much unwavering formula for determining what the lesser swings will produce with each club by carefully measuring the average of the full swing. I then made a business card with yardages plotted and each swing and club selection, and finally I plastic laminated 6 of them. I generally hit within a yard or two of that graphic. Anal retentive? Certainly. But it helps quite a bit, standing at say 78 yards, looking at the lie and the card to determine my best option to get it close.
I don't lie about yardage because it serves no one, and because surveyors are ridiculously honest about these things. But, in all honesty I'm not sure exactly how far I hit my driver right now. I'm sure it has the most variation.