Any easy, cheaper ways to increase MPG?

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Rettax3
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Re: Any easy, cheaper ways to increase MPG?

Postby Rettax3 » Fri Jun 07, 2019 4:35 am

Two things, and I wish I could find the actual study GM did on this...
1. GM did in fact do a comprehensive test with their engines to determine if running them cold was notably detrimental to their longevity as opposed to warming them up first. Interestingly, the added wear of idling them to warm them up was about the same as the increased rate of wear incurred by running a cold engine hard enough to drive it. In short, if the engine is warm enough to operate safely on the road, you aren't extending the life of the engine to any significant degree by letting it run longer to warm up at idle instead.
2. That test was done (IIRC) back in the carburetor days, now our F/I engines can be driven fine right from start-up, so the findings may be a little off, I admit. But I still doubt it makes much difference, and the added loss of time and fuel plus the extra pollution doesn't make sense.
I know most of my 4-cylinder and V-6 cars will warm right up once driving (gently of course, until warm, especially the turbo-charged ones as that DOES make a difference to the turbos), but at idle it takes much longer to get any heat from the vents... Bottom line, buy a coat and drive your car! :wink:

And no, if your FPR is working fine, it is working fine -replacing it would simply be preventive maintenance 'while you are there', and at some point you have to ask where you are going to stop -why not replace the fuel pump too? Injectors DO wear however, and start producing poor spray-patterns or stick and fire too short or too long a pulse, which is bad for MPG, performance, even engine life. Your ECM only monitors the 'average' mixture ratios, so if one injector runs rich, the computer will lean everything, including the other five out a smidge, trying to compensate -now none of your injectors are firing spot-on (not talking about the newest of the new here, just our era of cars)... They can also clog over time, so a good injector cleaner (like BG44k) can help tremendously, if they aren't actually worn out. I tend to prefer replacing them as a set, if you aren't going to have them flow-matched.


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Re: Any easy, cheaper ways to increase MPG?

Postby 3X00-Modified » Fri Jun 07, 2019 10:06 am

I would only replace the FPR if you know the pressure is bad, aka hard starts, long cranking... or if it's leaking through the vacuum line. That's something else to check to see if that could be causing the low MPG, but typically that will cause running issues as well since it will be very rich.



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Re: Any easy, cheaper ways to increase MPG?

Postby Cam2363 » Fri Jun 07, 2019 10:19 am

Rettax3 wrote:Two things, and I wish I could find the actual study GM did on this...
1. GM did in fact do a comprehensive test with their engines to determine if running them cold was notably detrimental to their longevity as opposed to warming them up first. Interestingly, the added wear of idling them to warm them up was about the same as the increased rate of wear incurred by running a cold engine hard enough to drive it. In short, if the engine is warm enough to operate safely on the road, you aren't extending the life of the engine to any significant degree by letting it run longer to warm up at idle instead.
2. That test was done (IIRC) back in the carburetor days, now our F/I engines can be driven fine right from start-up, so the findings may be a little off, I admit. But I still doubt it makes much difference, and the added loss of time and fuel plus the extra pollution doesn't make sense.
I know most of my 4-cylinder and V-6 cars will warm right up once driving (gently of course, until warm, especially the turbo-charged ones as that DOES make a difference to the turbos), but at idle it takes much longer to get any heat from the vents... Bottom line, buy a coat and drive your car! :wink:

And no, if your FPR is working fine, it is working fine -replacing it would simply be preventive maintenance 'while you are there', and at some point you have to ask where you are going to stop -why not replace the fuel pump too? Injectors DO wear however, and start producing poor spray-patterns or stick and fire too short or too long a pulse, which is bad for MPG, performance, even engine life. Your ECM only monitors the 'average' mixture ratios, so if one injector runs rich, the computer will lean everything, including the other five out a smidge, trying to compensate -now none of your injectors are firing spot-on (not talking about the newest of the new here, just our era of cars)... They can also clog over time, so a good injector cleaner (like BG44k) can help tremendously, if they aren't actually worn out. I tend to prefer replacing them as a set, if you aren't going to have them flow-matched.


Alright thanks. I think I will just replace them all. For the orings, should I use Oil, Silicone or gas to lube them?

3X00-Modified wrote:I would only replace the FPR if you know the pressure is bad, aka hard starts, long cranking... or if it's leaking through the vacuum line. That's something else to check to see if that could be causing the low MPG, but typically that will cause running issues as well since it will be very rich.


The car cranks and fires up almost immediately, even in the winter. So I wont replace it then. Just my injectors and O2 sensor. I might try a bottle of the BG44K first, then buy new ones if it doesnt improve.



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Re: Any easy, cheaper ways to increase MPG?

Postby Cam2363 » Fri Jun 07, 2019 10:20 am

Cam2363 wrote:
Rettax3 wrote:Two things, and I wish I could find the actual study GM did on this...
1. GM did in fact do a comprehensive test with their engines to determine if running them cold was notably detrimental to their longevity as opposed to warming them up first. Interestingly, the added wear of idling them to warm them up was about the same as the increased rate of wear incurred by running a cold engine hard enough to drive it. In short, if the engine is warm enough to operate safely on the road, you aren't extending the life of the engine to any significant degree by letting it run longer to warm up at idle instead.
2. That test was done (IIRC) back in the carburetor days, now our F/I engines can be driven fine right from start-up, so the findings may be a little off, I admit. But I still doubt it makes much difference, and the added loss of time and fuel plus the extra pollution doesn't make sense.
I know most of my 4-cylinder and V-6 cars will warm right up once driving (gently of course, until warm, especially the turbo-charged ones as that DOES make a difference to the turbos), but at idle it takes much longer to get any heat from the vents... Bottom line, buy a coat and drive your car! :wink:

And no, if your FPR is working fine, it is working fine -replacing it would simply be preventive maintenance 'while you are there', and at some point you have to ask where you are going to stop -why not replace the fuel pump too? Injectors DO wear however, and start producing poor spray-patterns or stick and fire too short or too long a pulse, which is bad for MPG, performance, even engine life. Your ECM only monitors the 'average' mixture ratios, so if one injector runs rich, the computer will lean everything, including the other five out a smidge, trying to compensate -now none of your injectors are firing spot-on (not talking about the newest of the new here, just our era of cars)... They can also clog over time, so a good injector cleaner (like BG44k) can help tremendously, if they aren't actually worn out. I tend to prefer replacing them as a set, if you aren't going to have them flow-matched.


Alright thanks. I think I will just replace them all. For the orings, should I use Oil, Silicone or gas to lube them?

3X00-Modified wrote:I would only replace the FPR if you know the pressure is bad, aka hard starts, long cranking... or if it's leaking through the vacuum line. That's something else to check to see if that could be causing the low MPG, but typically that will cause running issues as well since it will be very rich.


The car cranks and fires up almost immediately, even in the winter. So I wont replace it then. Just my injectors and O2 sensor. I might try a bottle of the BG44K first, then buy new ones if it doesnt improve. Or maybe not, just checked and that stuff is expensiveee. New injectors are the option I will probably take then.



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Re: Any easy, cheaper ways to increase MPG?

Postby Cam2363 » Fri Jun 07, 2019 10:27 am




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Re: Any easy, cheaper ways to increase MPG?

Postby 3X00-Modified » Mon Jul 08, 2019 3:50 pm

That's better than the cheapest versions out there, but I would make sure they come with a good guarantee and exchange option if you do buy them. Ebay is very risky for these kinds of parts, you have almost no one to turn to if they fail 3 months later.



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Re: RE: Re: Any easy, cheaper ways to increase MPG?

Postby Cam2363 » Thu Jul 11, 2019 2:50 pm

3X00-Modified wrote:That's better than the cheapest versions out there, but I would make sure they come with a good guarantee and exchange option if you do buy them. Ebay is very risky for these kinds of parts, you have almost no one to turn to if they fail 3 months later.
Thanks. I actually bought those, a new O2 sensor and IAC. Put the IAC in but need to find time to do the other stuff.

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Re: Any easy, cheaper ways to increase MPG?

Postby Cam2363 » Fri Sep 06, 2019 8:32 am

Ok, so I replaced the injectors and it seems like it did help. According to my obd2 app, I get like 18.3 mpg, now I dont know what it was like before, but this seems like an improvement. I'm also at like 210 miles one single fill up so far. Which is the second highest milage I've ever gotten, and this is with no highway driving. It could also be because I got gas at a different place, but only time will tell if there was an improvement or not

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