Fuel Mileage

[78P930]

I checked my fuel mileage the other day on my stock Euro 930 except for SC cams and K7200. With my "normal" in town, spirited, driving I was getting 11mpg, taking it really easy I got 12. Not much of a change for what was a drastic change in my driving habits. Is this normal or is there something that might be out of whack? The car doesn't appear to have a fuel system leak and does not emit black smoke. I don't expect to get 20mpg but at least a little better than 12mpg when taking it easy.
Pat

[mark '87 930]

I get between 13-15 with my car. I have a full exhaust.. that's pretty much it. I noticed that when my O2 sensor was functional and connected, I got as high as 17.

[David]

I got about 10 before my EFI project. I've never been able to take it easy in any car, so my mileage is always at the extreme low end. It'll be interesting to see what I get with EFI (if I ever get my car back )

[Lukesportsman]

Most of the guys on the 3.0 carb'd thread were quoting between 12-14 and that is with more ideal gearing, less weight and a whole lot less potential so the trade off isn't so bad.

How does she do at steady rate/highway driving?

[78P930]

I got 19mpg on the hwy, but that was before my rebuild. I'm taking a trip tomorrow and plan on checking it again.

[Chuck Jones]

I get about 11,5 mpg if I get on it...and about 13 IF I stay out of the turbo. So your mileage isn't out of the average if you kee your foot your foot out of the accelerator!! Some folks seem to get better mileage, but they must be tuned more critically.

[NathanUK]

Fit a wideband AFR meter setup, then you can see what might not be working right, if at all.

[William930t]

On a recent 1,000 mile trip (80% highway) I got a surprising 21 mpg with my all stock 930.

[squerly]

It's a 930... who cares.

[9dreizig]

As a friend of mine once said in reference to gas mileage " Velcome to the vorld of 80's zupercars"!!

[turbocarrera]

Single digits when baggin' it around town - not quite into the teens when babying it down the highway. My mix is really fat though. Can't wait for the EFI conversion and rebuild.

[Larry_Ratcliff]

Wow... I bet gas mileage could easily double with efi. My 74 with a 3.6 gets about 25 - 27 mpg on average and I tend to drive in a very spirited nature. A side note is that my car only weighs 2300 pounds to so that could be a contributing factor to the good gas mileage.

I am going to be switching out the 3.6 for an efi 3.3 or 3.4 turbo I am hoping to get at least somewhere in the low 20's for fuel economy.

[RarlyL8]

Any 930 should be capable of 13mpg in town and 21mpg on the highway. If you are not getting those numbers get to a dyno or LM-1 and find the problem. Most likely a WUR adjustment is in order.
EFI will likely not significantly do any better as far as mileage is concerned.

[gilach]

yah, i get around 19-21 on the highway...car is stock....the ole lady was impressed.

[turbocarrera]

I think it mostly depends on your right foot. My WUR pressures are in spec(1.6C, 3.3W, 5.8S) - with ~ 3.5% CO. I use a 10% ethanol blend too - that hurts.

Geoffrey from Racetek says EFI is good for a 20-25% improvement in fuel economy.

[RarlyL8]

I'll bet Geoffrey sells EFI systems.

[GaryR]

Originally posted by RarlyL8
I'll bet Geoffrey sells EFI systems.

Ya think?


Me, I'm going with a Leask adjustable WUR and see how she does..

[Chuck Jones]

I'm going with Brian's solution too...and am also getting the solenoid kit.

[GaryR]

Originally posted by Chuck Jones
I'm going with Brian's solution too...and am also getting the solenoid kit.

If I ever get my car back from it's G50 conversion i'll be installing the new WUR, the solenoid (I'm customer #1!), and a new LC-1 / XD16 soon too!

Don't ya love new toys?

[Ken911]

I think sandman said his milage was a lot better after he put in the adjustable wur and got it dialed in correctly close to 20 mpg if I remember correctly