Keep to quality OEM filter . You won improve mpg but will allow particulates through that may damage engine. If you really want to improve mpg then a remap is the best way to go but do tell or ask your insurers before remapping as some don't like it and hike your premiums up.
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The secret of flight is to aim at the ground and miss !
Previous Volvos 740 GLE . V40 CD ,V70 2.4 SE LPT.V70 D5 P2. V70 D5 Se Lux P3. Current Jaguar XF Sportbrake but still like Volvos
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