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post #1 of 42 (permalink) Old 01-20-2010, 06:25 PM Thread Starter
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A Little Bit of MPG Math!

Here's a simple math question that I would like to know the answer to if anyone finds the time to answer it.

My K&N intake is going to cost me about $290.90. I was told it will get me about 2-3 MPG more. On top of that I am going to do a custom catback exhaust from muffler tech running me $300.00 +, say $350.00 max. I was told that this will additionally get me 2-3 MPG more aswell. So here lies my question: If i spend the $650.00 to get a max of 6 MPG more. How long will it take until it starts paying me back. Additional information: 13.0 Gallon Tank Gas High avg $3.00/Gallon Car avg MPG 26.0 City and highway

Also if any of this info I have been given is false..please tell me, because i trust this forum and the people no it more than a business out to make money.
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post #2 of 42 (permalink) Old 01-20-2010, 06:53 PM
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The K&N deal is false. K&N filters increase the amount of air going into your engine by reducing the resistance. Any time the amount of going into your engine increases the car will increase the amount of fuel to compensate.

My average mpg is 42 with NO engine or exhaust mods at all. Believe me that you are looking in the wrong place for added mpg. You must address the way you are driving your car. I would suggest looking at the forum front page and going to the "all about mpg" section. I would read everything in this section and really address the way I drive the car. This will give you your biggest gains.

Is you balt auto or 5 speed? Year? mileage? SS or not?

---------- Post added at 09:53 PM ---------- Previous post was at 09:47 PM ----------

One more thing. Something that is for HP will NEVER add mpg and vice versa. There is no way around it. You must choose one or the other.

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post #3 of 42 (permalink) Old 01-20-2010, 06:58 PM
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ok I did your math anyway even though i agree with will
at 26 mpg going 15000 miles a year at $3 a gallon=roughly $1730 a year on fuel
at 32 mpg going 15000 miles a year at $3 a gallon=roughly $1406 a year on fuel so there you go



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post #4 of 42 (permalink) Old 01-20-2010, 07:39 PM Thread Starter
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I barley hit 25 MPG AVG with city and highway and i keep my foot out of it too and crusing at like 56 down the freeway i get only about 32-34. and barley 24 city...
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post #5 of 42 (permalink) Old 01-20-2010, 07:40 PM
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you need to look at your driving habits then



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post #6 of 42 (permalink) Old 01-20-2010, 07:50 PM Thread Starter
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I've been more concious recently and watch the Instantaneous MPG Meter and keep it at about 32 MPG highway and keep it in the high 20's low 30's crusing in the city, but my car still reads 24.3 after a week.
I read that excessive idling will hurt, there are a lot of traffic lights where I live and have to stop and sit for about 2-5 min on end at each. I also noticed that when sitting my car reads 0 MPG Instant.
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post #7 of 42 (permalink) Old 01-20-2010, 07:52 PM
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well yeah city driving is hard, honestly I can make my car get 24 or make it get 44 depending on how I drive and how much I care about economy that day, try a tune up, google hypermilling, check your tires



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post #8 of 42 (permalink) Old 01-20-2010, 07:57 PM Thread Starter
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How much is a tune up? Also my oil life is down to about 19% (tight on money) would this effect it at all, also i put in 91 octane gas, bad, good, dosent matter?
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post #9 of 42 (permalink) Old 01-20-2010, 08:11 PM
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what model is your car? i would say get your oil changed and use a decent motor oil. whats your mileage? if its over 50000 on stock plugs change them,



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post #10 of 42 (permalink) Old 01-20-2010, 08:22 PM Thread Starter
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I have a 08 LT and a little over 33000 miles. I also just take my car to the GM dealership to change my oil.
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