I pretty consistently get about 12,000 miles on the rear and the front G709 will last 15,000 to over 17,000. miles for me. If you are not getting about 25% more mileage out of your front G709 than your rear G704, then I would be really surprised. I would want to confirm you check your pressure prior to each new days ride and also confirm what tire pressure you are running (I run 38 front and 41 rear). A couple of friends get 20,000 miles and more out of their G709's and only run 36 lbs. on their fronts so I probably should try the lower pressure next time and see if that improves the mileage over my last tire (which was the + 17,000 miles).
P.S. Of course the G709 almost always has little to no cupping so in my view there isn't a better front tire for the 1800.....
I got 12,000 out of both front and rear on my last (first) set and I didn't pay enough attention to the air pressure. When I DID check it, I kept it at 41/41 cold.
At 12,000, I had minor cupping on the front and maybe another 1,000 miles or so to go with plenty more on the rear.
With this second set, I'm paying more attention and hope to get more miles out of it.
I use the bike mostly for commuting, some weekend jaunts and at least on weekends, sometimes get on it a little more than I should... especially on that first set when I discovered that I could light up the rear tire. :wink:
17k on the first set. 20k so far on second set that will be replaced within a couple months (if they're available) with another set. I wouldn't consider another brand as long as I can find Bridgestones.