My 2.9 is only getting 10-12 mpg

You can smell that it is running way to rich, what controls the air-fuel mix?

Yes it has stock gears and 33" tires but still I should be doing better on gas and you can smell the unburnt fuel

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1988 Ranger STX, custom built flatbed, winch, 33x 10.5 BFG mudders
1974 Suburban (AKA "the sub") lockers front & rear, 383 cu in not even close to stock motor, snowplow 37 x 12.5 HUMMV tires, 4.56 gears
1952 M38 (CJ3) Jeep - my newest project - 289 ford, hardtop, got it with not one wire in it. Hope to have it driving this year