The Frugal Diva always wondered how to decide between driving and flying if the distance was not too great.   Jon Lal at befrugal.com has a way to help you decide and some tips for saving on your travel plans. When planning a trip, start with a free online tool to decide whether flying or driving makes more sense. The Fly or Drive Calculator (http://www.befrugal.com/tools/fly-or-drive-calculator/) factors in time taken, cost and carbon emissions. Complete your reservation to get the most for your money: 1) book online 2) use a coupons and cash…