Quote:
Originally Posted by LarryJ
1. increase intake air flow by replacing air filter. They didn't distinguish between warm air intake vs cold air intake. I've read about warm air intake is definitely the way to go for fuel economy.
|
Air filters are relatively cheap, so it doesn't hurt to change them, but it would have to be really bad to effect the mileage of a hypermiler. As far as warm air/cold air goes, the general consensus is that warm air is better, but it doesn't work on all vehicles. A few members report success with cold air. I'd try warm first though.
Quote:
Originally Posted by LarryJ
2. Computer programming. They suggest recalibrating vehicle's timing/shifting.
|
This is very cost-prohibitive, and you will probably never recoup the initial investment to reprogram the vehicle's computer systems.
Quote:
Originally Posted by LarryJ
3. Spark Plugs. Replace spark plugs with mult-tipped plug that suppose to burn fuel more completely.
|
Electricity always takes the path of least resistance. After a few hundred miles the spark will start to favor one electrode over the other, and you'll end up with one spark anyway. Save your money. Don't buy into that gimmick. I did when I was young & stupid. Never got any power or economy gains from the plugs, but paying $5/ea for the plugs made the parts store happy.
Quote:
Originally Posted by LarryJ
4. Exhaust. open exhaust to increase air flow with cat-back system and beter yet, high-flow cat and even headers.
|
If you're hypermiling this will make no discernible difference. Plus, messing with your exhaust may put you in violation of emissions laws.
Quote:
Originally Posted by LarryJ
5. Synthetic Oils. replace oils with synthetic
|
I do believe in quality synthetic oils. You can get marginally better fuel economy with them over dinosaur juice, but the big payoff with synthetics is you can run them for extended intervals, and longer life of your engine.
Quote:
Originally Posted by LarryJ
6. SVO. related to converting diesel to run on SVO.
|
No comment, I don't have a diesel so I'm not well versed on the pros & cons.