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Kinda Lazy this morning and really don't want to go and get the GM manual. But I think its says you can use Bio Diesel up to B-20. I have used Bio-Diesel and noticed no difference. Not saying there is not a difference. Just noticed gas is up 11 cents a gal. Diesel in Longmont Colorado was $3.69.9 thats the cheapest since we left Tennessee on June 10th.
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