I went from a load range G to H for comfort of mind and I also changed brand saving money. The inflation tables will show you all you need to know except one factor important to me...the risk in some cases of lowering pressure to get a softer ride. If your current G tire should run at 90 pounds the tables may well show the H could run at 80 pounds but I really would not do that because that is cutting it close to factors keeping the tire safely on the rim. If higher pressures were the case, say going down from 110 to 100, I wouldn't be concerned. In any case keeping the same pressures should not change the ride in a big way but the peace of mind is for you to value as you will.