Is my MPG bad or normal?

[Sean37]

On my last tank I did a little over 100 freeway miles in one trip and then the rest of the miles were brief freeway trips (under 5 miles) to and from work, around town, etc. So I got 243 miles out of 13.8 gallons, which is 17.6 MPG. I usually average around 16-18. I think my mileage should average out to at least 20's when I take longer trips like this. I do get on it a bit at times, but not that much really. It's an auto with 3.42's and I changed plugs/wires/fuel filter about 5000 miles ago but it didn't improve.

[98v6]

i got 3.08's and get that in town with some street racing it's more like 16.8 though, try some seafoam in the gas tank i hear that stuff helps

[Bluebird]

Where can you get this Seafoam?

[98v6]

NAPA autoparts, if you don't have one talk to autozone or some place about B12 and its applications, i am not sure if it is used the same but it is a lot similar

[Distephano]

My car has a 5 Speed, and 3.23's. With about 70/30 Highway/City, I get about 28 MPG.

[Red2K1]

Same MPG as Distephano.

You can get Seafoam at O'Riley's Auto Parts.

[Ian]

change the PCV valve. its cheap, and it does a lot if its messed up

[Sean37]

ok I'll check that out when I get a chance. My car is coming up on 60,000 miles and I don't really know what needs to be checked out and/or replaced. I do need to get a transmission flush and change out the filter soon. Any other things that might need to be looked at?

[cassie]

I just changed my PCV and ran seafoam thru about 2 weeks ago

a HUGGGGE change. I get like 50mpg more

[FunkZ]

Like Distephano, I get from 25-28 mpg depending on whether I do primarily city or highway driving. I think this is typical for an M5 with 3:23's, and yes I do get on it a good bit. When my wife drives the car she gets 30. Auto's are usually slightly worse, but I would imagine low to mid 20's... not sub-20's?

[ChillPhatCat]

Lowest I've ever gotten was 19 and the highest was 32 driving at 65 MPH for 400 miles...

[Camarorulz]

I get 21-24 mpg with a mixture of city/highway driving (I drive an average of 80 on the highway though)

[ChillPhatCat]

<blockquote>quote:</font><hr>Originally posted by Camarorulz:
I get 21-24 mpg with a mixture of city/highway driving (I drive an average of 80 on the highway though)<hr></blockquote>

I drove 85 MPH for 13 hours straight and got 31 MPG...