HI'' MY 94, WITH 180K GOT 23 MPG. EMPTY AND 21 TOWING A 6X12 TRAILER WITH 1000LB. PAYLOAD WHEN I FIRST BOUGHT IT A YEAR AGO.RUNNING @ 75 MPH.
HAD A FUEL LEAK , REPLACED ALL FUEL LINES ,RETURN VALVE, WATER SEP., AND FUEL PUMP. TIMING MOVED WHEN TRYING TO REFIRE AFTER ALL THE WORK.(DIDN'T FIND THIS OUT TILL LATER). ALOT OF WHITE SMOKE AND MILEAGE WENT DOWN TO 13MPG. SO WE REPLACED THE DV'S WITH 191'S.(THAT IS WHAT THEY SAID WAS WRONG) NOT IT. NEW INJECTORS INSTALLED, OLD ONES WHERE RIGHT TO SPEC. NO CHANGE. FULL 4'' EXHAUST, DROP IN K&N. GOT 15 MPG.
SO GOT TIMING SET,FIXED KDP , INSTALLED A #6 PLATE IN MIDDLE POSITION. HELPED WITH WHITE SMOKE AND SOME OF MY POWER RETURNED, BUT STILL 15 MPG.
THEN HAD ALL VALVES SET, NO DIFF. TOWING, BUT VERY NICE EMPTY.
THIS TRUCK STARTS INSTANTLY, RUNS REAL STRONG, NOT A SHUTTER OR NOTHING ALL THROUGH THE POWER RANGE, SWEET. BUT NOW I GET 15 MPG. TOWING AND 24 MPG. EMPTY RUNNING @ 75 MPH. COULD MY TIMING STILL NOT BE SET RIGHT?
SPENT ALOT OF MONEY SO I COULD GET LOWER FUEL MILEAGE.
WHAT YOU GUYS THINK? DOUG

 

What are you complaining about? I think the fuel mileage you are getting now is outstanding

 

I Was Just Wondering Why I Lose 9 Mpg.now With The Small Load I Am Towing. Other Guys I Talk Too Towing Up To 10,000 Only Lose 4 Or 5 Mpg.
Before All My Problems I Only Lost 2 Mpg. Just Wodering If I Am Not Right On My Timing. Running Solo Is Sweet, But I Tow 90% Of The Time. Doug

 

What are you towing? Aerodynamics can hurt you a lot especially over 2k RPM.

 

I Am Towing A 6x12 Cargo Trailer 6' High And 1000lb. Payload.running @ 1900 Rpm's.75 Mph.
The Thing Is Before My Problems With The Same Trailer My Mileage Was 21. Now After All The Work It Is 15mpg.
Still Wonder About My Timing, Should I Have It Rechecked?think That Could Be Where My Fuel Mileage Went? Doug