Miles Per Gallon Drop

[Wblv17]

take that fool to the back woods and run it 20 to 100mph ten times, thank me later

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[Ruby5.0]

That sounds like my typical drive home from work every day ;-) I wanted to make sure the rings were fully seated on the pistons, so after a 500 mile break-in where the speed was varied dramatically, I did start to drive it like I stole it. It's already been to 140 several times and in triple digits almost every day. To clarify this, I drive on a rural 2 lane straight road with nothing around except cow pasture.

I do have another question kind of off topic, but partially related. With the 3:15 axle I have, what race would I have a better chance winning against an auto trans 2015 Mustang GT with either a 3:55 or 3:73 axle ratio, a straight quarter mile drag, or a 50 mph roll and go, or a top end run ? Just curious what the 3:15 ratio is actually beneficial for. Thanks all !

 

[Carzzi]

Here's what mine looks like over its life:

 

[GPhilly04]

Here's what mine looks like over its life:

Do you use an app for that? I'd like to be able to plot my MPG over time as well.

 

[mikef523]

Do the math, don't rely on the computer to tell you MPG.

Although it may be true that the cars computer is not that accurate, that still does not explain why it would show such a difference in MPG after having the oil change.

 

[GPhilly04]

Although it may be true that the cars computer is not that accurate, that still does not explain why it would show such a difference in MPG.

Exactly! If the computer is showing +1mpg vs. a hand calculation at 0 miles, in theory, it would show the same +1mpg at 2,200 miles.

If it's off, it should be off no matter what. When there is a drop of 15mpg it's not just the computer rounding or something.

 

[Carzzi]

Do you use an app for that? I'd like to be able to plot my MPG over time as well.

I use fuelly.com. It is a great place to track all your cars. Their mobile interface is quite smooth. Allows you to track mileage, fuel cost, trends, and also annotate your fill-ups. Also allows you to view other users' consumption stats.

 

[Cueball]

Oil change should not affect mileage in the least. I changed mine at 1,500 and 6,000 and noticed no change. With mostly highway driving I am getting between 22-23 mpg calculated. I don't beat on it.

 

[Ruby5.0]

Cueball, I notice you have upgraded your exhaust and CAI. Did you notice any difference between your mileage after you made those changes ? Also, what rear axle are you running ? I'm just wondering if these things account for the great mileage your getting, aside from driving it easy. Did you notice any change in performance after making those mods ? I'm trying to figure out which exhaust/CAI/Tune to go with for mine. It seems these Coyote 5.0 motors are hard to get to sound like the old muscle cars with that deep throaty sound and that is what I'm looking for.

 

[ScottsGT]

It's likely just coincidence that it was timed with your first oil change, but refinery problems have caused a switchover to winter blend a few weeks early this year. Winter blend has less energy, hence less mileage.

Crap! I picked my car up Nov 5th last year and we still had summer blend around here at that time. I could see a big drop when the winter stuff came out.
Was the switch over nation wide, or just a few of the refineries?

 

[Cueball]

Cueball, I notice you have upgraded your exhaust and CAI. Did you notice any difference between your mileage after you made those changes ? Also, what rear axle are you running ? I'm just wondering if these things account for the great mileage your getting, aside from driving it easy. Did you notice any change in performance after making those mods ? I'm trying to figure out which exhaust/CAI/Tune to go with for mine. It seems these Coyote 5.0 motors are hard to get to sound like the old muscle cars with that deep throaty sound and that is what I'm looking for.

Actually, right after I changed them out my first trip got ridiculous high mileage - then the car adjusted to them (I did not tune). I would still say slightly higher than stock. I have the stock gear on the MT cars - 3.31:1. I love my MBRP street - has the H pipe. Pretty mellow and deep, except at WOT. :clap2:

 

[Ruby5.0]

Cueball, not to change the subject on my own post, but I just noticed your exhaust combo. I am trying to find something that does sound like the older muscle cars, and not that raspy sound a lot seem to have. Definitely will have to be an H pipe for that. Do you have any sound clips of your car ? As for the gas mileage, on my last tank I put 93 in it and drove it pretty sane for a change. Never went over 75 and most of the time the tach never went over 1750, even during shifts and I am sitting at 22.6 mpg on the computer. So, maybe the car has adjusted to the new oil and is actually seeing a difference. It's a far cry from that first tank.

 

[Cueball]

Here you go. I must note this was right after I installed it, cold engine. It may sound a bit raspy, but it is not at all. With miles it has mellowed, deeper, no rasp.
[ame]

 

[Ruby5.0]

Thanks for the reply and the sound clip Cueball. That exhaust does have a deeper sound to it than most do. The H-pipe is the only way to go for that deep sound. So you must have got the catback system and pulled the resonator, correct ? Did you do it yourself and take it to a garage ? Sounds good my friend. I hope mine will sound as nice once I get something on there. I will probably go with the Airaid CAI too. I just like the way it comes. Looks very professional. I would like to find a system where you can get the pipe going to the throttle body painted to match the car. That would be sweet. Thanks again for the sound clip !!

 

[carsontech]

It's likely just coincidence that it was timed with your first oil change, but refinery problems have caused a switchover to winter blend a few weeks early this year. Winter blend has less energy, hence less mileage.

Winter blend should have more energy. That's when there is usually less ethanol. Pure gas has more energy than ethanol. Ethanol requires a higher temp to combust, so that's why there is suppose to be less ethanol in gas during the winter.

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