My grandpa never had any problem with soft tonneaus when he used it. Never had any flapping or other negative effect to the mileage.
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Originally Posted by EcoSuperDuty??
I envision using my truck as a long distance cruiser one day so need to stick to a fuel that's readily available everywhere at any hour.
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Actually, if you would eventually add the secondary fuel system for vegetable oils, it's an advantage, since you would have another fuel option, no need to sacrifice the ability to run on regular Diesel fuel.