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Over the years, I have sold many Edelbrock 1406 carbs and they have proven themselves to be very reliable, maintenance free and relatively lean calibrated compared to the traditional Holley. So, when David Vizard mentioned the Edelbrock test, I had plenty of confidence in their products already. Leaning the mixture at cruise would definitely help the mileage issue (in my opinion) on a non-towing application. As far as the motorhome experiment goes, I am unsure if the probable loss of power (although most likely slight) would hamper its ability to pull the amount of weight I am dealing with. Of course, a lot of towing mileage will always depend on "creative" driving (hitting the hills at the best speeds that the law will possibly allow) to help stay out of the near wide open throttle portion of the carb. In your case, I would try the 1406 out of the box and calibrate as necessary. Let us know if you end up needing the bottle to help with the performance.
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