If 2% really has benefit, it seems like a 5 gallon bucket of B100 would go a long way. .4 gallons in a 20 gallon fillup and that 5 gallon bucket would last 12.5 tanks or about 5000 miles.

Maybe it is worth it to drive out of the way to a place that sells B100.

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Alan Hamm
'87 300SDL 277K Miles
'89 560 SL 68K Miles