Winter blend fuel also will play a part in fuel mileage during this time of year.

 

Please don't air up to 40psi. Stick to the recommended 32

Reset your trip everytime you fill up, do the conversion to find out what your actual MPGs are.

Philly driving is AWFUL. I know. If you are seriously just doing the usual run up the boulevard all of the time, you will definitely be looking at a good 14-15 mpg in the winter. Especially with letting the car sit to warm up and such.

 

why the 32 psi? it seems like when im on 40 he car seems to glide smoothly and thats what ive been doing using the app and trip meter ive been getting 14-15, where before i was getting 16-17

 

1-2 MPG difference is normal for the winter blend change.

Airing up to 40 gives you less of a contact patch on the tire, and you wear out the middles a lot faster. Car manufacturer's spend a ton of money on the research of recommended tire PSI for the car, it just makes sense to follow them.

The only time I recommend straying away, is if you change the overall size of the tire and the tires are wearing at a different pattern. For example the outsides of my 18s were wearing a little quicker than I would have liked, so I aired up to 34.

 

hmm that could explain y my tires was wearing fast...thaanks for shedding some light

 

The type of tires also affect your mpg. If you are on winter tires now that will hurt mpg. Your next set you may want to look into the Michelin defender or GY Assurance Comfort tread. Both are all season and have a low rolling resistance. Or even the Michelin energy series tires if you are not doing performance and need grip.

Running the optimal tire psi is critical for mpg and safety. If you are still running stock sized tires factory 32 psi is what you should run. Like said if you run a different size the. Stock you will most likely need to figure out what psi works best. I have 245/45-17's and they like 36-38 psi. Just need to observe the tire and see where the wear patch onit is. You can was the tires and drive around the block. Then look at where the tire is now dirty. It should fill the tread completely. If it shows dirt on the side wall you need more air if you see tread that is still clean you have too much. Also keep in mind the effect of outside temp on tires and psi will change. Also as the tires warm up during a drive they increase in pressure too.

Tires asside, make sure your brakes are moving freely and not dragging causing more friction. Alignment of your car can hurt mpg as the tires are fighting each other side to side instead of rolling forward. Obviously like covered the usual tuneup related items help.

 

Brake drag is a good one! And even check you wheel wells from building up with that slushy icy crap if you've been driving in slushy icy crap. It can create drag...