The 4.7 gears help make up for the 34.5" tires so it would be roughly the same as a 3.73 gear with 32" tires so that's not the problem. Dealers say a lot of stuff to try to make you think everything is normal. How many miles do you have on the Bronco at this point? It does take some miles to break in and then the mpg will go up and probably the power as well.
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