i love my gas!

[ricks350z]

it beats my 06 z gas for sure..i use mid grade gas ..man i save so much on my $$$$

is everyone using midgrade or premium gasoline?

[marleyfan]

I would suspect that almost nobody is. Why would you use premium or even mid when the car was designed to run on regular? This has been discussed in several threads.

[GoodbyeCavalier]

Ive been using mid. getting 32-35 mpg mixed driving

[proxim2020]

Yeah, do a search on "octane". I think there's 4 topics on the issue. The cars were designed to run on 87. Any higher and you're donating to the oil Exec's yearly bonus with no benefit to you.

[Jemdawg]

You're not getting better fuel economy. There's several reasons why, but if you want to convince yourself, conduct a statistical experiment

[XterraVersa]

I run mid-grade here. Only because it is 87 octane & the manual doesn't say to run 85 octane at higher elevations.

Can't complain to much. 33-37 mpg in the Versa vs 12-16 in the Xterra.

[evil200000000]

I just had a oil change recently and my mileage is slightly up comparing back to winter time. I know having the AC on during the winter time could be a factor and just wondering if the oil change could be a factor too? thanks!

[proxim2020]

Yes, oil can play in your MPG. Old broken down oil and sludge can causes excess friction in the engine. More frictions = pressing down on the pedal further to continue your same driving style. Type of oil can improve mpg. Numerous member have touted .5 to 2 MPG rise when switching to synthetic.

[marleyfan]

I would suggest that given all the factors affecting MPG there's no way anyone can attribute a .5 increase to a switch to synthetic oil. I'm not saying that snyth may not increase your mileage but such an insignificant increase could be attributed to any of a number of factors.

[c5neb]

I would suggest that given all the factors affecting MPG there's no way anyone can attribute a .5 increase to a switch to synthetic oil. I'm not saying that snyth may not increase your mileage but such an insignificant increase could be attributed to any of a number of factors.

I would have agreed with you completely if I didn't see it myself. I have logged the last 24 fill-ups and only twice (long trips at highway cruise) did I see 35 mpg or over. Usually, it is 32-34 mpg. Since I went to synthetic oil, I have logged 35 mpg for the last three consecutive fill-ups. This is on my normal commute to work at 45-55 mph with mostlly cruise. I am still looking for other contributing factors.

On the gas grade issue, I agree with those who say that more than 87 octane is a waste of money. If any vehicle pings on acceleration, then go to the next grade up. Otherwise, save your money.

[CodeRed]

my last fill up i got 23 mpg...wtf i drove at below 4k rpm's all the time somthing is uppp!

[GoodbyeCavalier]

I had issues with mpg till about 8,500 miles. that seems to be about the average break in time.

[motoguy128]

89 or 90 octane mid-grade in the midwest is often cheaper that 87 octane due to either ethanol content or some issue with fuel supplies. either way, I use the cheapest one. I recorded an all time low of 19 mpg recently, but that included about 20 minutes idling with the A/C on and my normal small town routine of lots of very short trips and stop and go driving. It's around 30 when I'm mostly on 2 lane highways or the expressway.

I'm curious to see what my mileage will be like on my Colorado trip next week with trailer and the mountains.

[proxim2020]

If any vehicle pings on acceleration, then go to the next grade up. Otherwise, save your money.

If a V's pinging this early, take it back to the dealership and tell them to give you a new engine.