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Depends on where you live and if you tow altitude. If you are a flatlander, it doesn't matter on the towing, the 4.10 will do fine. If you are going to tow up mountains, then a 4.30 will help. Difference in mileage would be about 1 mpg more or less, IMHO. I have the 4.10 and have towed "heavy" (not a 40' 5th wheel, but a 30" bumper pull), and never had a problem maintaining speed limits up mountains and still making 8.5-9 mpg. If you are towing a monster 5th wheel then a 4.30 would be the way to go.
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2002 F-350 SRW Lariat,4X4, PSD with too many goodies to list. 182k and a very strong 7.3. SOLD
2008 F-250, SC Lariat, 4X4,Shortbed, Pueblo Gold/black, V-10, 4.10, auto, Delivered on 9/7/07, great looking rig. South Texas bumpers front/rear, Air Raid Intake System, Diablosport Predator, Magnaflow, Husky's, JJ's, Ford alarm/remote start, Marathon seat covers, Sirius, PIAA, Access cover, Weatherguard tool box, Rhino liner, Michelins, Duraflap mud flaps, Escort 9500i, MagHytec rear dif cover.
2007 Lincoln LT (wifer's grocery getter),Superchip,Magnaflow duels, K&N dropin, Leer Browning Special
1996 Ford Bronco EB; almost stock
2007 Kubota 900 RTV diesel with goodies.
pappy's truck
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