For Fathers Day I'm going to get a new tank. I havent decided yet which one. I seem to remember someone saying there might have been fitment issues between one (both?) of these tanks and the Edelbrock carb. I dont have an Edelbrock yet but it's on the wish list maybe someday after I'm convinced that it's a totally reliable mod -but that's a totally different unresolved topic. So does the shape of the 4.7 with it's fake little wings help to keep the bike cooler? Is that really even an issue? With the gas sitting so low that it never reaches the petcock unless I tip it over (I do that inadvertantly anyway ) I'm really leaning more towards the 4.0 - unless the wing shape helps cool it. But the extra 30 miles or so that the 4.7 would give... Well that's tempting too. I live in Rhode Island where you're never that far fom gas - I'm just lazy and HATE filling up the stock tank so often.