speeding...

[SmaartAasSaabr]

"benificial to your engine crusing at a high speed normaly ups the revs in the gears"

In general, the higher the RPM of the engine, the more fuel that will be consumed.

Not really. It is more tied to the position of your foot. At 6 000 r/min but with not touching the accelerator, most cars (at least those made since the mid 1980's and with manual gearboxes) won't even run the injectors, so you burn nothing.

But, increased engine speed generally increases the amount of energy lost to friction. Running at a lower speed and a higher throttle opening is generally beneficial to milage, as more gas turns into push.

Anyway, of course to push the car through the air at 100 mi/h is much more energy than 60 mi/h than 30 than 10. But the engine and the gears throw a bit of a curveball into that. It takes more energy to push the car at 2 miles per hour than 1. But to drive 1 mi/h, you will burn much more gas than at 2, since to go one you keep pressing the brake It's basically similar to that.

A highly aerodynamic car with a tall gear ratio, such as a Chevrolet Corvette, I have no doubt will return optimal fuel consumption in the 75-80 mi/h region. At 55... you're still in fourth (and still practically lugging that big V8)

[yemntftb]

Around 80mph in the audi 5th gear I get like 30mpg or so...I only average about 25mpg, but I always feel like aslong as I'm keeping a constant speed, its good for the gas.

In 25-30 mph zones, my gas milage typically goes down.

All cars are different.

[Arvetus]

yes, a lot of it depends on gear ratios. For example, at 40mph, I turn about 2200 RPM's. At 45, overdrive kicks in and drops it to about 1400. Yes, I'm going faster, but I am also turning less RPM than I did even at a slower speed, thus better fuel efficiency and I can go further on a gallon.

Once you've reached your top gear, the only way you can go faster is to make the engine turn faster. MOST cars (automatics) shift into overdrive around 45mph. Beyond that, the faster you go, the faster your engine turns, the more gas you burn.

And yes, keeping a constant speed is better for gas because every time you accelerate, you flood the engine with fuel to push your car ahead. Once you reach a steady clip, it doesn't take much to keep the car rolling.

[bunny]

sorry to create an argument. i really dislike negativity

[Braveheart]

I never speed on purpose. I always think about getting stopped or in a accident so you wont get anywhere faster. An RD is a fun electrical device to have when you are traveling. Most of these new cars you speed without knowing it when the windows are up. I also say that RD's can make you a safer driver, you are more alert and when it alerts you,you tend to slow down. Everybody be safe and enjoy your RDs.

Also about MPG, I know that GM vehicles cruise at 65 running about 1500 rpm. I know that my T/A does it in 6th gear. Good on gas.

[GET 1T DONE]

YAY RADAR DETECTORS!!! haha, back on topic.

[StlouisX50]

Want to save gas money get a turbo

[SmaartAasSaabr]

Want to save gas money get a turbo

and remove it

[Arvetus]

Also about MPG, I know that GM vehicles cruise at 65 running about 1500 rpm. I know that my T/A does it in 6th gear. Good on gas.

Yeah, depends on the gearing in the trans. My Impala with the 3800 package is geared at 3.05. The Impala's with the 3400's are geared at 2.86 which means they turn less RPM at 70mph than mine does... I turn an even 2000 RPM at 70mph, while the 3400 engine will turn probably 1600 RPM.

An RD is a fun electrical device to have when you are traveling.... I also say that RD's can make you a safer driver, you are more alert and when it alerts you,you tend to slow down. Everybody be safe and enjoy your RDs.

Totally agree...

[Scammed by Scorpion]

I quit using radar detectors/(jammers) in 1993 until I got a ticket in PA in 1996 by a cop who is a liar. I wasn't speeding that night and I don't drive carelessly now that I use one, but if I'm being watched, I want to know. I know for a fact cops lie and as long as cops lie, I will use one.