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All about MPG All about maximizing your Miles Per Gallon (MPG)

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post #11 of 27 (permalink) Old 02-07-2014, 09:04 AM
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Quote:
Originally Posted by Deven534 View Post
Ok I will take it on the highway and try that. But is there any commom issues with these cobalt that I have to be aware or that would affect mpg??
If your HO sensors go bad and you have a check engine light the ECM will keep engine in open loop and you will notice a considerable drop in mpg.

---------- Post added at 01:04 PM ---------- Previous post was at 12:58 PM ----------

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Originally Posted by alexxxx89 View Post
When I changed my fuel filter I saw night and day. My mpg when from being stuck at 24.2 (no matter what-tune up, tires, etc) and jumped to 32.7 on the hwy. I have pics to prove it.
Can't see how a fuel filter could affect mpg, but if you say so and nothing else was done at the same time. Fuel mixture is controlled by the ECM depending on throttle position, air flow, air temperature and air pressure. If all your HOs are working correctly your car should run at maximum fuel efficiency.

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post #12 of 27 (permalink) Old 02-07-2014, 09:38 AM
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---------- Post added at 01:04 PM ---------- Previous post was at 12:58 PM ----------

[/COLOR]

Can't see how a fuel filter could affect mpg, but if you say so and nothing else was done at the same time. Fuel mixture is controlled by the ECM depending on throttle position, air flow, air temperature and air pressure.[/QUOTE]

Yeah Coby I couldnt believe it either. The night before I drove from Ft. Campbell, KY back to Florida I changed the fuel filter and nothing else. It kept increasing, and by the time I got into Georgia the fuel range read 542MI (on a full tank).
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post #13 of 27 (permalink) Old 02-07-2014, 10:50 AM
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I changed a fuel filter one time and noticed amazing throttle response and power right off the bat. Maybe the filter was restricting fuel?

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post #14 of 27 (permalink) Old 02-07-2014, 11:05 AM Thread Starter
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I do not smell fuel at all while driving or parked. I will look at the spark plugs this weekend and let u know. Where is the fuel filter on my car? Some people were saying it only had one built in the fuel pump.....is there an in-line one at all?? If so, where
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post #15 of 27 (permalink) Old 02-07-2014, 11:51 AM
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Those ppl were dropped on their heads at birth. The fuel filter is right behind the fuel tank by the filler neck. If the plugs are bad or not AC delco it very well could be your problem. If they're bosch....well just replace then no matter how new they look

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post #16 of 27 (permalink) Old 02-07-2014, 11:58 AM
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A tune up helped mine a lot. My plugs were old.. but I did a full tune up at once. Went from 25mpg summer time to around 29.. that's what the dic said between highway and back road driving.

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post #17 of 27 (permalink) Old 02-07-2014, 01:24 PM Thread Starter
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So what should I all do in a tune up for my cobalt that has 45k and just had an oil change? And only use AC DELCO spark plugs, nothing else? And should I change ignition coil boots as well, or r they just one whole piece, like boot doesnt come off of ignition coil on cobalts?

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post #18 of 27 (permalink) Old 02-07-2014, 09:42 PM
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You shouldn't have to replace them. The plugs should be good at 45k but I would still change them. Only ac delco plugs. A tune up would be air filter, oil, spark plugs, fuel filter, make sure your tires are filled with the correct amount of air, ummm you could do tranny fluid too if you really wanted to but it wouldn't help your mpg

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post #19 of 27 (permalink) Old 02-08-2014, 10:27 AM Thread Starter
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so where is the fuel filter on mine? and what is the correct tire pressure that i should be at?
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post #20 of 27 (permalink) Old 02-08-2014, 11:41 AM
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The recommended pressure for each tire is 30psi as indicated on the driver's side door sill. As a general rule, bumping up the pressure can yield increased mpg's. I usually run 35psi in the summer, 30 in the winter (for traction).

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