Have done the following to a 1994 Std Cab 4X4, 5.2L, auto, 3.55 gears.
Started with a Transgo shift kit then added Magnecor wires, brass cap
and rotor, Champion truck plugs, MPI Super Street throttle body, K&N
FIPK, Mopar Performance SBEC, Dynomax cat-back, hi-flo catalytic and new
O2 sensor. All upgrades done within the last month or so. Everything up
to the exhaust work gained very significant torque and throttle response
and 3-5mpg city/highway. The gas mileage increase with the performance
gains was just what I wanted. When the exhaust work was done I lost the
mpg gains and then some. I went from getting 16.5 combined city/highway
down to as low as 14.2. On strictly highway mileage I went from 20.1
(best) to 15mpg at best now. I gained some nice breathability with the
exhaust albeit at a high expense of economy. Has anyone else ever run
into similar mpg problems with a combination like mine? Am wanting to
add an MSD soon but would like to get mpg problems identified first.
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