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Originally Posted by Grzly03
We have new (5k miles) F-350 to tow our 3730FL. I have been seeing a lot of ads about mpg improving electronic devices, some wired into truck electronics with jumpers, other which plug into OBDII. Any experience with these or similar devices, and do they void the warranty?
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We pull our 3400RL with a 2011 6.7 SRW ex. cab, 8ft. bed with power to spare. I would not want to change any thing on this engine. We've run WI to Williamsport PA. At 12.2 m.p.g. Back to WI at 10.2 with a 20m.p.h. side wind coming north through IL. WI to Central TX at 11.4 (dashboard readings). We try to maintain around 63-65 mph.