There's no magic bullet for volvo's, just the normal mods: Scangauge (its also easy to replace the cluster with the factory trip computer, plug and play), and making sure everything is functioning properly. This should net 32-34 on the open road with a n/a v70. Beyond this, you'll have to get into aero mods. Volvos are "bricks", anything you do (grill blocks, under trays, wheel covers, etc.) will net an appreciable difference.
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Shooting for 600 miles of range at 65-70 mph out of a vx.
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