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Considering this motorhome probably has a rear gear ratio of 4.10, and uses a 400 Turbo (of course with a 1:1 final gear), you are absolutely correct that I am rarely using the 1/3rd of the carb's functions that include much to do with the idle circuits. With that said I believe you are also correct that my testing does not hold any generality other than in towing circumstances. By the change in "responsiveness" over the Q-jet, I would bet the performance of the Edlebrock would be plenty for your 383 project. With the parameters of no wind, flat surface, 60 mph, etc., it would be hard for me to predict how this Edlebrock would compare with other Edlebrock types, or with other options altogether. I would suspect that final drive ratio including "most" proper transmission and gear ratio, along with tire diameter is going to have the most to do with your 25 mpg goal. I would bet that an overdrive trans is in your plans. Of course, with the type of final gearing required to get to this goal you may have to sacrifice a little on the performance end. BUT, that leads me right back to the purpose of the motorhome experiment. In this case, (pulling a substantial load), better performance led to better economy for the age old obvious fact that it was easier for the motorhome to pull itself and its load with the Edlebrock over the factory Q-jet, which led to better fuel mileage due to less of a struggle. Keep us all informed on your project. Maybe David has more insight on this.
Thanks,
Tony Brown
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