Milage drop

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I seem to have experienced a drop in fuel milage over the last 1-2 months. I have changed fuel filters several times, switched stations I purchase fuel at, changed air filter etc. Have not noticed a drop in power but I sure see it in milage. Last tank full went only 385 miles. Have checked all turbo lines (pressure side). Any hints on where to look next. My dad and uncle swear it is the fuel. Both have large commercial boats (twin engine 350 to 1,000 hp) and have noticed an increase in fuel consumption also. I know that the refineries on the gulf coast are busy making heating oil for the winter and heating oil and diesel are cut from the columns at only a 2 to 5 degree differance. Maybe we are getting a hybrid blend of heating oil with the diesel to make it go further (yield more). Any suggestions would be appreciated.

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92 Ext. Cab, Auto trans. , 3. 54 Non-LS, Isspro Tach and Pyro (pre-turbo), 210,000+ miles, straight pipe,old and abused but still running strong!!!!

 

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I'm only getting about 14-15 mpg myself. I used to get sixteen.

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http://coffeewithJesus. homestead.com/web1.html 89 1-ton, Amsoil System 3000 5-30,K&N air filter, cleaned-up exhaust, Dynomax straight-thru, rebuilt pump, 12cm wastegated turbo, thermostaticly controlled twin 14" electric fans, intercooler, modified 518 OD transmission, Gear vendors OD controler, R-134, louvered fenders, 93 aftermarket smoothe grille; 78 35'Avion, 93 Lance 900 slide in with generator and power jacks. Jesus saves!

 

[Archive]

I think it is fuel quality too.

Next to last tank yielded almost 15 mpg (equal to highest mpg before mods). Got fuel from the Flying J at Fraiser Park. Last tank back down to 13. 5.

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'93 W350 Club Cab, Bright White, 5 sp. , 132K, Factory Options: LE, 4. 10 Limited Slip, 7600 lb. rear springs, tachometer, front stabilizer bar. Mods: Banks stinger plus, Linex bedliner, 25,000 lb gooseneck ball, 10,000 lb receiver, Tekonsha brake controller, POWER WAGON injectors-WAY faster than stock!.

 

[Archive]

I have been getting 20mpg (honestly) since day one and haven't lost a mpg yet though. These figures are empty! Not loaded... ...

 

[Archive]

It is hard to understand how different our mileage is with the same engine. I am now getting between 21 and in most cases 22 mpg at 70mph with the AC wide open. shortly after I bought it I was getting 16, 17. This is all empty. I had it turned up and I have more mid range power and my mileage jumped to 22mpg. I also feel the sulfer content will affect the mileage. Low sulfer fuels will yield lower mileage. I also thing that is a Cummins thing opposed to all diesels.
dean

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1993, W350, 70K miles, two toned paint, mopar tack, rhino liner,LE, club cab, 22mpg.