I remember high-rise intake manifolds, some of them were so tall the fuel would fall out of atomization before getting to the combustion chamber, it made things worse than leaving it alone.
A small spacer will allow the fuel to cool slightly before entering the engine, allowing more fuel to enter the combustion chamber, and increasing horsepower.
There are a lot of things out there right now promoting increased fuel economy, a lot of them are no more than snake oil, and some are downright harmful to your engine.
The biggest things you can do to increase fuel economy are:
1-most important--keep your tires properly inflated. If I had a dollar for every car that came into my shop with tires that were more than 5 PSI under what they should be, I wouldn't have to work again. (probably 8 out of 10)
2-Fresh spark plugs (platinum if it's not an oil burner), wires, cap and rotor, PCV valve (this gets forgotten a lot)
3-clean air filter and fuel filter. Most are pretty cheap, if you own a MoHo, you can replace them in the spring before camping.
4-Synthetic oil. This can save a little fuel, but the savings is more in the increased lifespan of your engine. Make sure you have all minor oil leaks stopped before switching, as a small leak with dino oil will become a major hemorrage with synthetic.
5- SLOW DOWN. 65-75 mph is great for getting there, but if I drive my truck at 55 I get 17 MPG with an F250, I get 12 at 75.
These are my fuel-saving tips, all are proven to save fuel, or wear, or both.
It probably should go in its own thread, I may move it there later.
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