Fuel economy went to crap after a tank of bio - Ford Powerstroke Diesel Forum
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Old 06-14-2014, 07:14 AM
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Fuel economy went to crap after a tank of bio

I just bought a 2000 Ford F250 7.3L a month ago with 230K, mods are edge attitude, straight pipe and 36in tires
When I first got it, it was getting pretty decent fuel economy. I recently filled up 2 tanks of B20 Fuel and now my fuel economy has gone to crap. Ive gotten 100 miles in a half tank of mixed highway city driving.
I changed the fuel filter but still crap. I couldn't drain the filter canister. i think it was clogged and I didn't have time to unclog it.

Do you think that might be why its not getting good fuel economy?

Thanks

Mike
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Old 06-14-2014, 02:53 PM
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You are barking up the wrong tree. B20, or any blend of Biodiesel, should have only a negligable effect (up or down).

Any change in drive ability that you noticed?
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Old 06-14-2014, 03:36 PM
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I noticed 1 maybe 2 mpg less running B20. I thought I read some where it doesn't burn as hot as reg diesel.
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Old 06-14-2014, 04:57 PM
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Even ASTM B100 cetane ratings vary, however, 2 MpG is a lot. As general guideline, the only noticeable difference between D2 and B20-B80 should be that the injectors are quieter.
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Old 06-16-2014, 08:20 PM
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No, no real difference in drivability. I just filled up with regular diesel the other day and my fuel economy is way better now. So maybe my truck doesn't like B20?
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Old 06-16-2014, 10:19 PM
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I know that when my truck had a sharp decrease in MPG I found out it had a sticking caliper. I replaced the caliper and my MPG sprang right back to normal.

Now, when I fuel up, I put the tank filling then walk around the truck touching each rim with the back of my hand. If one feels hotter than all the others, it may be dragging.

I hope this helps!
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Old 06-17-2014, 01:23 PM
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I still maintain there is something else...unless the MPG comparisons were hand calculated.
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Old 06-18-2014, 11:25 AM
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I can't calculate the exact mpg because my speedometer hasn't been calibrated to the tires. I have on the truck.
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Old 06-18-2014, 12:16 PM
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Quote:
Originally Posted by geero808 View Post
No, no real difference in drivability. I just filled up with regular diesel the other day and my fuel economy is way better now. So maybe my truck doesn't like B20?
I was going to suggest you change the fuel filter. Bio tends to 'clean' stuff out of the tank & fuel lines which ends up in the filter. But, if your truck's MPGs have come back up using Dino-diesel, that may not be it. It could be the quality of the Bio-diesel.

I filled up in Bend, OR once with B100. The truck ran like a top! I've used B20 around here and it ran just as well.
john galt likes this.
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Old 06-21-2014, 02:14 PM
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just guessing here but is it possible the bio is either impure as Darryl said. or maybe the bio is bustiung loose old deposits that are straining through the filters I would try cleaning out the filter housing as thoroughly as possible when you get the time and changing the filters one more time and see if that helps
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