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I have a '91 E350 (8 pass) w/7.3 IDI that as the family truckster usually averages 20 mpg (and as high as 22)

One of my buddies told me the 6.9 IDI did much better then the 7.3, can anyone confirm this ? Mostly, Ive owned 7.3 P'Strokes.

Im looking for a beater daily driver 6.9 or 7.3 that can do about the same as the van
 

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Our '93 F250 7.3L IDI gets about 20+ at 70 MPH, 5 speed w/OD and 3.73 gears.
 
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I have owned both a 6.9 and a 7.3 idi. The 6.9 had a C6 and 3.55 gears. The best I ever got on it was 18mpg. The 7.3 is a 5sp with 3.55 gears and I may have gotten 20mpg a few times. 18mpg is more realistic and on short runs about 15-16mpg. Both of my trucks have been 4wd which makes them a bit heavier. I drive conservatively. No jack rabbit starts and maintain the posted speed limits. Some guys claim to get in the mid 20's on these engines but I don't honestly see how. Still 18mpg is close to double what the gas models get.
 
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