oil for MPG

[Dupree]

Just wondering how much MPG difference to expect from going to a 5w-40 from a 5w30 ???

I have been using amsoil hdd 3000 series heavy duty diesel oil 5w30
want to go to rotella synthetic 5w-40
Jeep 4.0L


maybe I need 0w30 hmmmmmm

oh yeah I commute daily with her 50 miles and average 20 mpg. All out highway is around 23 mpg

 

[Quest]

not very much.

Consider improving in car arodynamics, lighten it's cargo weight(incl. human occupants within), get higher fuel economy vehicles (20mpg is not that good, IMHO), and so on.

There are lots of things one can do to improve fuel economy and one shall not need to go through such extremes such as extreme hypermiling and such to get respectable fuel economy...

Q.

*seriously, 20mpg/23mpg hiwy is not that good but if that's what you currently have on hand, I guess that's all you can do then...*

 

[Dupree]

I plan on getting a beater commuter but I will only be able to use it ocassionaly I have a 1 mile long dirt driveway, a rocky hill climb going up 150 feet to my farm, so if I get a car I have to park at the road and walk it

 

[oilyriser]

probably will lose 0.3 - 0.5 mpg with thicker oil

 

[Dale_Knight]

Just an opinion but the Amoil 5W30 might be giving as good as you can expect. I been using Motul ester based Gear 300 75W90 gear oils in the non-limited slip diffs and a Motul engine oil with a fairly high content of ester, not the 300V and have been getting around 25-26 mpgs in an 07 Pathfinder where most are lucky to see 21-23 mpgs, but keeping the tire pressures up to sidewall max pressure plays into it as well.

.

 

[FZ1]

I bet it's at least 1 mpg. .02.

 

[Bill in Utah]

Look at your right foot.

It will make more impact on your MPG than ANY oil will.

Bill

PS:
Quote:
oh yeah I commute daily with her 50 miles and average 20 mpg.


So do I! (exactly 50.0 miles door to door) I get 43-45mpg...

BTW:

 

[FZ1]

It's both!

 

[Gary Allan]

I'd venture by your economy numbers that this is in a Wrangler with a 5 speed. A Cherokee would (or should) do better by a decent clip under those conditions.

If it's a Wrangler there's not much you can do. Your numbers almost match mine ..but you're slightly better on the commute. 23+ was my best on long, single warm up, mileage. Speed doesn't seem to alter it too much. I think that the engine develops too much power at too low a speed. There's a hump to the torque curve, but it's most of the way there by 1800 rpm.

Bill: There's no way to fuel squeeze in a Wrangler w/4.0. It just ain't gonna happen. If you're one of the fortunate Wrangler owners with an auto and a 4.0 you can have the choice of pathetic or miserable depending on your driving habits.