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  #1  
Old 11-18-2005, 02:48 PM
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350 sdl mileage off?

My 90 sdl is getting 21 mpg. When I last checked 3000 miles ago it was getting 24. My driving hasn't changed and I use diesel only to start and warm up so it can't be winter fuel. Compression is 375 +/- 15 on all 6 cylinders.
Only change I notice is that there is a little smoke at idle. Nothing I can see in the rear view mirror. Doesn't smoke on heavey accel. either. I do see some smoke at night when there is a car behind.
I am thinking the car is running 'rich' in gasser terms. I am afraid to mess with the alda because the car runs great. Smooth and ~ 11 secs to 60.
Any ideas?
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  #2  
Old 11-18-2005, 11:10 PM
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I get about 25 mpg at about 70; 21 mpg at 80. Just put 3000 mi in a trip to Tampa and back, total mpg at 24; diesel ranged from 3.09 fla to 2.25 in VA.

I think all diesels smoke. At night I see smoke too; I like to floor it and kill bugs....

burned less than a qt of oil too. 115K on the car.
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  #3  
Old 11-18-2005, 11:12 PM
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Dirty air filter maybe? Brake dragging? Carrying anything heavy? Tires not inflated properly? Winter fuel?

It could be a few things.
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  #4  
Old 11-19-2005, 10:52 AM
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New air filter.
Brakes spin freely.
Extra 26 gallons of vo and corresponding AL tank.
Tires at 30 psi front 33 rear on 225/55/16.

Could a change from 205/65/15s to 225/55/16s (16 rims weigh less than the stock 15s) and 26 gallon tank cause a 10%+ drop in mpg?
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  #5  
Old 11-19-2005, 05:53 PM
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I don't know. It seems to me that once you start talking about WVO YMMV, no pun intended. Generally WVO has a little less energy content than an equivalent volume of diesel, and I'm not surprised your mileage is it the low twentys given that you also have a separate tank you haul around. Check one of the online tire size calculators to see what type of change you should expect in odometer readings based on your tire swap.
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  #6  
Old 11-19-2005, 06:20 PM
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Could be that they're starting the winter blend? I dunno if that accounts for 3 mpg though.
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