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Originally posted by Ygrene I know there was a study that demonstrated that having your tires inflated to a certain psi could affect your gas mileage as well. Less rolling resistance and such. I've heard one of the best ways to maintain good fuel economy on an automatic is to, every time you come to a complete stop, put the car in nuetral. When you are ready to go again, rev the engine to roughly 5400rpms and then put the car into drive. This helps alleviate the high gas consumption of the engine as it struggles to overcome the inertia of the autombile.

air pressure is a big deal, not just to handling and tire wear, but as you said fuel economy.

if you have ever ridden a bicycle with tires that were not filled up properly know exactly what i'm talkin' about.

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Originally posted by Ygrene I've heard one of the best ways to maintain good fuel economy on an automatic is to, every time you come to a complete stop, put the car in nuetral. When you are ready to go again, rev the engine to roughly 5400rpms and then put the car into drive. This helps alleviate the high gas consumption of the engine as it struggles to overcome the inertia of the autombile.

That's for noobs, get it up to 100km/h, then put it into neutral, rev the engine and throw it into reverse. You get mad skids and quite possible the better than average chance of that car never burning any petrol at all, ever again!

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Originally posted by VAR air pressure is a big deal, not just to handling and tire wear, but as you said fuel economy. if you have ever ridden a bicycle with tires that were not filled up properly know exactly what i'm talkin' about.

yea i knew about that, and it actually does improve the gas mileage a little if you have the tires inflated properly to their designated psi.

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quote:

Originally posted by Ygrene I know there was a study that demonstrated that having your tires inflated to a certain psi could affect your gas mileage as well. Less rolling resistance and such. I've heard one of the best ways to maintain good fuel economy on an automatic is to, every time you come to a complete stop, put the car in nuetral. When you are ready to go again, rev the engine to roughly 5400rpms and then put the car into drive. This helps alleviate the high gas consumption of the engine as it struggles to overcome the inertia of the autombile.

lol, so are u saying i should do a burnout at each stoplight

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Originally posted by Lilith That's for noobs, get it up to 100km/h, then put it into neutral, rev the engine and throw it into reverse. You get mad skids and quite possible the better than average chance of that car never burning any petrol at all, ever again!

Now THIS, I like!

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Originally posted by ak87 incorrect to low of RPM produces a "lull" (my term) in a car anyone who drives standard knows this if you put your car into 3rd gear at 1500rpm, you engine is not producing the right power to gear ratio and requires a lot more effort and inefficiency to get the car up to the optimal RPM for that gear (3000rpm) also lets say your on the highway in 5th gear doing 100km/h (maybe 2300 rpm) and to drop down your RPM to "save on gas" you switch to 6th gear your now doing 100km/h in 6th gear at roughly 1700rpm your engine is not efficient at this point and your not saving on gas at all

in general, the statement i made is completely true.

Here's a good discussion on the does RMP affects mileage question : http://www.physicsforums.com/showthread.php?t=165455

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Originally posted by twilightki : It feels like something you'd listen to at 4 in the morning, or listen to in your car while you're going in a tunnel.

quote:

Originally posted by Lilith That's for noobs, get it up to 100km/h, then put it into neutral, rev the engine and throw it into reverse. You get mad skids and quite possible the better than average chance of that car never burning any petrol at all, ever again!

Thats cause at 100 km/h the letter R on your shifter doesnt stand for Reverse. It stands for Rockets!

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. . .. . .. . . . .. . .

Do it!
Now
Rockin!

there are so many variables affecting gas mileage- type of vehicle, type of driving, weight being carried (ya, dump the fat bitch), tune of vehicle (which means having good oxygen sensors in today's vehicles), air pressure in tires, good bearings that are greased properly and routinely, a/c usage, the list goes on...

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Originally posted by jfk-pilot lol, so are u saying i should do a burnout at each stoplight

My first car was an automatic and I never ever had the guts to try a nuetral-drop. Maybe some day I'll get my chance.

Now, speaking from experience on gas mileage, I can tell you that the faster I go the better gas mileage I get. I drive a TON of highway miles; about 2500 this month so far. My car is a Civic with an intake, and a complete aftermarket exhaust, header/cat/midpipe, etc. On most trips I drive between 70-75 and my normal gas mileage is around 34 mpg. I've gotten as high as 38, which blew me away. That was an extremely fast trip from Pittsburgh to Philly. Close to 80 the whole way.

DISCLAIMER: Ygrene does not condone exceedation of posted speed limits

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Originally posted by Ygrene My first car was an automatic and I never ever had the guts to try a nuetral-drop. Maybe some day I'll get my chance. Now, speaking from experience on gas mileage, I can tell you that the faster I go the better gas mileage I get. I drive a TON of highway miles; about 2500 this month so far. My car is a Civic with an intake, and a complete aftermarket exhaust, header/cat/midpipe, etc. On most trips I drive between 70-75 and my normal gas mileage is around 34 mpg. I've gotten as high as 38, which blew me away. That was an extremely fast trip from Pittsburgh to Philly. Close to 80 the whole way. DISCLAIMER: Ygrene does not condone exceedation of posted speed limits

yea i basically make a 60 mile trip on I-95 mon- friday between my school and my house so that comes out to a lot of highway miles, and where i live in florida almost all of the roads are like small highways were the average speed is like 55.

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