A report was on last week on CNN on how to increase your MPG's and besides the obvious the guy they were interviewing said that he turns his SUV off at every stop light. I've got the technique down and experimenting with it now on this tank of gas. Has anyone else tried this and what were your results, and if it effected the vehicle?

 

Sounds like a way to wear out the engine faster to me, but that is in effect what the "hybrid" Silverado did to try and save on fuel. It just had a big generator in it instead of a starter to be able to start the truck while in drive automatically.

 

if not the engine for damn sure the starter... and you know its gonna go out that one time when its 95* and you have your old lady with you

 

LOL Ladys like their A/C

 

it prob uses more fuel starting it back up than just letting let sit there runnin

 

for diesels its uses less fuel to shutoff/restart than it does to idle, or atleast with big diesels it is, but diesels don't like to be shutoff/turned on very quickly either.

 

A carb engine uses more upon startup cause it dumps fuel into the carb where a TBI engine will only dump fuel from the injector of the cylinder thats going to fire.

 

Sounds similar to what I saw some guy do that on TV a while back. He was nuts! Had a new Soltice and put it in neutral every chance he got while moving, almost simultaniuosly started the car and driving at the same time, and while in N, turned the engine off WHILE moving down hills at 65mph on California highways only to start it up WHILE moving at the bottom of the hill and go again. It's asking for issues if you ask me. Just don't drive your whip like NASCAR or get a smaller car.

 

I read a little bit about hypermiling...if you search hypermiling on google there are forums out there for it too.

A lot of those guys do what they call pulse and glide. They will get up to speed (pulse), then shut the engine off with an injector kill switch instead of turning the key off, because turning the key off shuts off the electrical systems on the car and in some cases will engage the steering column lock. Then they coast (glide) until they slow down enough, then put the trans in gear and let the clutch out to get the engine running again without using the starter. Then they pulse again to get up to speed, and repeat. Of course, this only works in manual transmission cars. There were some guys talking about getting close to 90 mpg in their Hondas and other cars like that.

In newer cars, it's actually more efficient to coast with the engine in gear than in neutral because of DFCO. When DFCO is enabled while coasting, the engine shuts off the injectors completely, whereas coasting in neutral requires the engine to burn fuel to maintain idle speed. The only way to make coasting in neutral more efficient than coasting in gear is to shut the engine down completely.

 

The stock tune dosent use DFCO very effectively either. But it is really hard to tune especially to make it work at low speeds <40 without shutering. But I think you can gain more by leaning the engine out as much as possible at light loads with an increse in spark advance along with it.