Same thing happened to me after doing cap/rotor/wires/plugs at 193k. Turns out #1 has no compression and #4 is misfiring. Haven't had any more time to check the wires or timing or why there is no compression in #1.
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My truck with 271k miles an 305/70/17 with 3.73 gears gets 13. before the tires it got almost 17 still with over 200k miles on the oe drivretrain...
Damn good looking truck for 271k
The best ice gotten with mine is 14. Admittedly the 5.7 is a bit inadequate for a pickup of this size. I have also noticed the type of fuel I use makes a difference. I get substantial better mileage by running 91 octane ethanol free gas. This spring I am going to get a black bear tune calibrated for 91 and see what that does for me.
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