I had one with my old trailer. I pulled with a 92 F250 with a 460 gas. It helped a little about 1 to 1 1/2 per gallon. I went to diesel and it made no difference. I ended up on my 08 6.4 changing the exhaust, and putting in a programmer. I get not bad mpg but I now have a lot more power.
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Darryll & Cassy
2009 Montana 2980RL
2008 F350 King Ranch Dually.
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