I'd say you have 4.10's the same as I do. The 225/70's are about the same circumference as the 215/75's that mine came with and it runs about 2200-2300 or so at 60 mph. The transmissions are the same so I'd guess that you have the same axle ratios. For what it's worth, I've been told, second hand of a guy that put a Mazda B3000 engine in a Ranger that had a 3L Vulcan engine. The Ranger with it's original gave poor mileage, the same as mine. When he put the Mazda version in, he was getting mileage as you describe. The guy that told me that was a reasonably reliable source, and I have no way to explain why that would happen... but that's what they claim. I know that there is no way that my truck, on it's best day on summer gas with me driving 50 mph would it ever even dream of coming close to that. 24 mpg is the absolute very best it ever got and that was averaging somewhere a little over 50 mph. Right now I have 235/75R15's on my truck and it will turn about 2000 at 60 mph. That resulted in about 30 more miles per tank of gas... and that's driving about the speed limit of 62.5 mph (100 km/h).
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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