Fuel Economy

[TLyttle]

If fuel economy is youir goal, dump the 185s ASAP, and get a good set of 175s. MY 07 sedan really benefitted from the narrower tire, and more rigid walls helped also. Run a few pounds below max printed on the tire. Works for me...

[hitmoninfinity]

Hey guys, I'm wondering if you could give me some insight. I just got new tires and wheels for my 07 4 door. Ever since I'm getting at least 20-30 less miles per tank. I'm averaging about 325 miles per tank right now. I had steelies before, but the new wheels are the same size. I guess the new wheels are a little heavier but should they make that big of a difference?!

[goliath1812]

hmm, when I switched over to Konig Heliums (same size wheel) I didn't really notice a difference in MPG, even though the wheels should be much lighter than the steelies...

[TLyttle]

Not enough info, hitmon. Are the tires or wheels wider than the ones you were running before? Is the compound or tread design more aggressive than before? Did you change the pressure?

I'm not sure that lighter wheels/tires make much difference to MPG; handling I can believe, but I'm out on MPG difference.

I ran the stock junk tires out (that didn't take long), and bought Hankook mileage tires (not my original choice). Not much difference in handling or mileage once I took the pressure up a few pounds, and they do seem to be wearing much better.

Lots of variables that will change your fuel mileage drastically! Wide wheels eat gasoline, as do wide tires, soft compounds, and tread design. It takes gasoline to push wide, soft, noisy tires, simple as that...

[hitmoninfinity]

Originally Posted by TLyttle

Not enough info, hitmon. Are the tires or wheels wider than the ones you were running before? Is the compound or tread design more aggressive than before? Did you change the pressure?

I'm not sure that lighter wheels/tires make much difference to MPG; handling I can believe, but I'm out on MPG difference.

I ran the stock junk tires out (that didn't take long), and bought Hankook mileage tires (not my original choice). Not much difference in handling or mileage once I took the pressure up a few pounds, and they do seem to be wearing much better.

Lots of variables that will change your fuel mileage drastically! Wide wheels eat gasoline, as do wide tires, soft compounds, and tread design. It takes gasoline to push wide, soft, noisy tires, simple as that...

The tires and wheels are the same size as before. Specs say the wheels weigh 17 lbs. Not sure what the steelies weigh. Tires are Yokohama AVID TOURING-S 32ish PSI.

Anyone have any ideas on what else might cause a sudden drop in MPG?

[malibuguy]

my last tank was 42.5mpg beating the fuck out of it & locating where the speed limiter kicks in

[Altitude]

Originally Posted by malibuguy

my last tank was 42.5mpg beating the fuck out of it & locating where the speed limiter kicks in

You must be filling the feeder tube for the gas tank. I believe the 40+ figures for hyper milers - but not for someone that goes WOT all the time.

[malibuguy]

Originally Posted by Altitude

You must be filling the feeder tube for the gas tank. I believe the 40+ figures for hyper milers - but not for someone that goes WOT all the time.

i let the pump click off....regaurdless how i fill wont change mpg as long as its the same every time


My last tank 53.01 my personal best with the exhaust...2nd best overall...i didnt particulary drive super efficient on this tank and drove in unmastered areas

[digitalrain]

Malibuguy, thx for the tip on the Mobil 0w20 on the other thread.

Just curious , but how much is the cost for a jug(4.5 qts) of the Mobil 0w20 in your area? It costs $48 here. I spend around $900 a year for gas and could save around 10% using the Mobil. So I'd be down a bit if I kept the twice a year oil and filter change sched. But that doesn't take into account possibly less wear on the engine due to using synth...

Originally Posted by malibuguy

i let the pump click off....regaurdless how i fill wont change mpg as long as its the same every time


My last tank 53.01 my personal best with the exhaust...2nd best overall...i didnt particulary drive super efficient on this tank and drove in unmastered areas

[rningonfumes]

lol! Ya, take one for the team.

[B789]

16.139878951 km per Liter of 87 Regular Gasoline from Petro Canada in my 2007 Yaris Sedan having 89,127 kms on odometer and 15" steel rims. Calculation Method used is 601.9 km in 37.175 Litres.

On average drove within/around speed limits. Journeys involved combined Highway and city with couple of times stop & go on Toronto Area freeways and 60% of the time Air Conditioner was on as well.

[Spidermandud]

^37.96 mpg

I had to look it up. :D

[malibuguy]

my last tank, 51.9 or .89 something like that

my best tank with the exhaust, but only i think my 3rd best overall

[Hershey]

'08 sedan w/ 4 speed auto . 40.63 m.p.g.. Tires at 35 p.s.i..

[RT_Smith]

'07 Sedan auto on 175/65R14's with 111,000km driving at ~105-110km/hr and 90+% highway and occasional A/C.

18.24km/liter or 52mpg

I find temperature makes a big difference. The warmer the better.

[RT_Smith]

That's on regular 87 octane Shell.

[rningonfumes]

Yes, I've found the same....the summer heat here in Cali is doing wonders for my mileage. Record breaking actually...personal records.

[goliath1812]

I really have to focus on how I drive to be able to get 40 or more...usually I come in around 39-41. My last tank, I tried non-ethanol gas and got 44.7. And now I've heard they want to put even more ethanol in the gas? Not looking forward to the bigger mpg drop when that happens.