Posted by CenTex Farmall on April 20, 2011 at 10:18:39 from (67.142.178.20):
In Reply to: Trying to save gas posted by 37chief on April 19, 2011 at 21:03:03:
Hook a vacuum gauge to your intake manifold and note the highest reading on straight and level at desired speed. On the gentler hills try to maintain this same vacuum reading. You'll find yourself lifting your foot slightly and sacrificing some rpm and speed. When you go over the other side let the vehicle coast up to regain the lost speed.
What you're doing with this is trying to maintain a constant load on the engine. It will work best when empty. In any case do not let the engine lug or you will get on the back side of your power curve and mileage will once again decrease. Downshift if necessary to try to keep the vacuum gauge in range.
By itself I can milk 15 mpg out of my 82 chevy dually with 454, quadrajet and cast iron exhaust. Pulling though I'm back down to 10. With a heavy load you'll just have to forget about mileage and get the job done!
My '81 Camaro with 350 returns 26 mpg on the highway but it's setup just for that. 2.73 with overdrive, tuned Q-jet and headers, tight quench and short cam. Before that I tried a 292 straight six and it returned 28 mpg, but was just an old stock motor out of a 2-ton.
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