Com'mon folks, I only got three responses to this post the first time.
There must be more folks than that out there that have some ideas or
suggestions on how to get my economy back. Has everybody else gotten
better performance and economy out of their exhaust work? One last time:
Am resending this message as I did not receive an answer as of yet and
did not know if it had been received. 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 (2 3/4in pipe), 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 ignition control box and coil soon but would like to get mpg
problems identified first. Any ideas why the exhaust work caused the
mileage to go down?
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