I did all filters yesterday including last Octobers air filter and found it to be extremely filthy including sand that had collected in the canister. Lots of sand put on the roads this past winter and may be the cause for poor fuel economy.

Too early to tell yet, I'm only 100 mi into the last fill of B-20 at $2.80 a gallon. Regular diesel here is $2.42 and reg gasoline is $2.35 ...........BB