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I haven't seen a diesel dave thread in some time, but I think he is well over 50mpg with a 3/4 ton dodge. If I remember right (probably not) he topped 60mpg. That's with a 7500 lbs truck and a 6.7 l motor. You could probably put a honda civic in the back and not change the milage much. One of those Toyota trucks at half the weight and half the displacement should be able to match his numbers.
There I go trying to derail this fine water injection thread again.
I don't have time now, but definitely want to build a water system for my truck. Don't expect numbers even half of diesel daves. I expect to get into the mid 20's, but my truck is heavy with tools. The aerodynamic drag of a lumber rack loaded with ladders or lumber doesn't help. I don't drive with pulse and glide or engine off coasting and my highway miles are small compared to putting around on dirt mountain roads. I still have big plans for the motor. Lot of room for improvement.
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