The only gallon jugs of gatorade I've seen have sucrose as the first ingredient and dextrose as the second.

Yes you are correct, the ingredients say: water, sucrose, dextrose.........My point is that its sweetened with those properties instead of the smaller bottles that contain high fructose corn syrup.

Sucrose is, for all intents and purposes, the same as high fuctose corn syrup.

I would argue that they are the same, see below:Studies that have compared high-fructose corn syrup (an ingredient in nearly all soft drinks sold in the US) to sucrose (common table sugar) find that most measured short term physiological effects are equivalent.[dubious – discuss]; however, studies that compare the long term effects between sucrose and fructose have yet to be conducted. For instance, Melanson et al. (2006), studied the short term effects of HFCS and sucrose-sweetened drinks on blood glucose, insulin, leptin, and ghrelin levels. They found no significant differences in any of these parameters.[53] This is not surprising since sucrose is a disaccharide that digests to 50% fructose and 50% glucose, whereas the high-fructose corn syrup most commonly used on soft drinks is 55% fructose and 45% glucose. The difference between the two lies in the fact that HFCS contains little sucrose, the fructose and glucose being independent moieties. Even so, Melanson et al. found that "Longer-term studies on connections between HFCS, potential mechanisms, and body weight have not been conducted".Fructose is often recommended for diabetics because it does not trigger the production of insulin by pancreatic β cells, probably because β cells have low levels of GLUT5.[54][55][56] Fructose has a very low glycemic index of 19 ± 2, compared with 100 for glucose and 68 ± 5 for sucrose.[57] Fructose is also seventy-three percent sweeter than sucrose (see relative sweetness) at room temperature, so diabetics can use less of it. Studies show that fructose consumed before a meal may even lessen the glycemic response of the meal.[58]I'm not a wiki advocate but this provides references so I'll use it. While they are close, they are not the same.http://en.wikipedia.org/wiki/Fructose#Compared_to_sucrose

"for all intents and purposes" its the same thing.  I don't mean it's literally the same thing.  I mean sucrose is one molecule of glucose (glucose=dextrose) bonded to one molecule of fructose making it 50:50 glucose/fructose.  HFCS is also a combination (unbound) of glucose and fructose which can vary from 42-55% fructose content.  I believe Gatorade uses the HFCS-42 variety meaning you would actually be getting less fructose if you just went for the HFCS.Now, you could argue that the unbound fructose in the HFCS is particularly more damaging to your health but, for all intents and purposes for everyone on this board who wishes to consume dextrose and not fructose, sucrose and HFCS are the same.

Do you think that there is enough in Gatorade, especially since Kiefer says not to fret over Fructose much during backloading to make a difference? I don't know the breakdown in the Gatorade, sucrose (50/50 fructose-dextrose) comes before Dextrose, so the actual amount of pure fructose is still probably less than the dextrose correct?

you may be right……..I've read both books twice now, I start mixing them up haha