Mpg

09-19-2002, 02:12 PM

Anyone know have ballpark numbers on how many miles per gallon a 73E with original MFI gets? Just curious.

CamB · CamB's Garage

Crappy. My guess is 15-20+ miles per gallon (15 round town, up to and maybe beyond 20 highway). Probably chases single figures on the track.

Rot 911 · 09-19-2002, 02:25 PM

My '72E got around 13-14 around town and 20-23 on the highway.

weber92037 · weber92037's Garage

My 73 E Targa got around 15-16 in town and better than 20 on the road.

09-19-2002, 03:04 PM

Thanks very much! That is helpful info.

jpnovak · 09-20-2002, 04:31 AM

funny, my 71t with E cams and P/C set with webers gets about 15 around town but got 26 on the last trip I took. I thought it was running quite well on the interstate.

Jamie

Phoenix · Phoenix's Garage

My '73 t w/ PMOs and L cams gets a steady 13mpg.

Jamie: What's your jetting on the '71? I keeping thinking I should be getting better milage but every mechanic I go to tells me its normal. Meanwhile my tailpipe is pitch black a sure sign it's running very rich.

jpnovak · 09-20-2002, 05:45 AM

If I remember correctly the idle jets are 155. I don't remember what the others are. I will check this weekend. I can tell you that a good ignition makes a huge difference. I did an Crane points conversion and stock everything else. Make sure that the groundstrap, and ALL connections are very clean. Improves drivability dramatically. Of couse, tuning the carbs takes some practice. I have to richen mine a bit. They appear to run lean with the cooler weather we have had the past few weeks.

Jamie

Phoenix · Phoenix's Garage

Jamie: What i steh model number for your Crane points? All I can find on their webs site is model XR-i and it's listed for '55-'74 Ford & GM. Is there a specific one for 911's?

millzeee · 09-20-2002, 06:42 AM

if i am super smooth and cruise at about 75mph i can eek 32mpg out of my 3.2 carrera

Paul Franssen · Paul Franssen's Garage

Hey guys, I trust you all know US and Imperial gallons are different sized! The left-side-of-the-road driving type are 4.5461 litres and the U.S. type are 3.7854 liters.
Am I right in assuming Ozzies and Kiwi's and S.Africans are Imperial types? OT: we continental Europeans always assume most of the world drives on the right, but that may well be close to being wrong: look at India, Kenya, Japan... Then, I think China drives on the right side of the road. BTW, my 88 Carrera consumes about 11-11.5 litres per 100 km (go ahead and do your own calculating, but it's pretty good!). You can see what that costs at anything between US$ 0.85 (Luxemburg) and US$ 1.20 per liter... It's like the rain in Spain it gaes quickly daen the drain

jpnovak · 09-20-2002, 07:46 AM

Oliver,

I beleive that I have the XR700-0231. I am sure its the XR700 just not sure that the 231 is the correct designation. I have had it for about 2 years and never once thought about points again. well worth the money...

CamB · CamB's Garage

We do use imperial gallons, but I converted (hell, I was guessing anyway) to US for our 'Merican brethren.

What I meant was 10-15 litres/100km - I generally use l/100km.

Jag XJ6 - carburetted - 20l/100km (ouch), city/motorway (translation = city/freeway) driving.

3.2RS engined 911T - approx 14l/100km - 250km jaunt through twisty country roads (heavy foot).

2.0T (the old engine) - about 12l/100km city/motorway.

2.7CIS - about 14l/100km city/motorway.

Yep, I'm anal.

Tyson Schmidt · 09-22-2002, 04:02 PM

I recently drove my '72 T 1,100 miles non-stop from Seattle to L.A. a few weeks ago. Kept her right at 90mph the entire way. I managed 26 miles per (US) gallon. Not bad.

BTW, ever driven an autocross prepared car, with very stiff and worn out Victoracer tires, 3 degrees of negative camber, no sound insulation, and no stereo for 17 hours straight? My back still hurts, and my ears are still ringing. (But hey, I got 26mpg!)