MPG

Just checked Mileage at fill up. I clocked 30 mpg on mixed use driving. Shell 89 pump gas. I may be able to get 35 if all highway:~)

These are really economy cars, see?

I have gotten between 15 and 24 MPG. I have to admit when it is city driving I flog it pretty well from light to light, but always within the speed limit. :>) 30 is great.

Forgot to mention my H2O IM weighs 2275lbs. So it's no lightweight.

My 1776/ small dual carbs gets 28 highway at best...

I'm content to record my fuel consumption in kilometers per gallon, and NOT convert numbers into MPG...That way I can stay blissfully ignorant at the rate those 44idf's are sucking up 92 octane juice!

Marty, that sounds about right and is in agreement with my mileage readings. Since we have virtually the same engine and similar wet weights (mine was scaled at 2335# at Carlisle a couple of years back), your highway estimate is right on. Oh, by the way, the Red Man seems to be perfectly content running on 87 octane fuel.
Hoss

If you really wanna be proud, stick with MPG, but change the 'M' measure from miles to meters. That makes my last 27 miles/gallon come to 43,551 MPG. I like it!

I have been getting 10 MPG on my 1835cc with dual EMPI HPMX 40's. I thought it would improve after I synced the carbs and advanced the timing to 30 as it ran better and got rid of the stumble. But still gets 10 MPG so I think it is running really rich. The PO rejetted from 52 to 55 idle jets to get rid of some stumble with timing set at 28. I have been thinking of replacing the carbs with Redline's Weber 40 IDF from Air Cooled.Net and they will jet according to my engine specs. Any ideas out there?

10 mpg on an 1835 is, well......ridiculous. That's about 30% of what it should be. I'm running a stout 2,110 and even that gets 26-28, depending on driving. You should be at least as good as that - my car weighs 2,000 lbs.

If you have the money, I would go for the Webers, especially if they set them up for you. I've had mixed reports on the EMPI carbs - some are great and some not so, but getting new Webers from Aircooled should be a better bet.

Make sure you replace the gaskets at top and bottom of the intake manifolds when you swap the carbs, too.

gn

Fred-try to contact Larry Jowdy-he is in Ontario, Calif, and is listed under the "shops" tab above right. Highly respected and knowledgeable with air-coolers.

Fred.
Maybe hang a bucket off your exhaust to catch and recycle all that wasted gas your pumping through that poor little engine!
Or, like Scott said, take it up to Larry and he will at least double your mileage.
His email is: ljowdy at aol.com

Larry Jowdy will be the fix!

Fred---I know you will get going on fixing whatever i causing the lo MPG you are having.

No doubt you are running super rich--if you could hook up an AFR meter you'd see it. With our aircooled engines super rich running like you are seeing means that gas will be going into your oil sump and if you get a lot of gas in with your oil you will have a bigger problem than poor ga mileage. Gas is a solvent and can remove the oil from your pistons.

It's a good idea to change your oil more frequently if you have been geeting that kind of gas mileage for long.

Good luck on straightening that issue out.

Guys, thanks for the advice. I did notice that my oil level seems to be increasing over full but never thought it would be fuel. I am going to get it sorted right away without much driving. I have a guy near my house that works on VW's and sync'd my carbs and adjusted the timing and it ran much better. Thought that might help the mpg but it didn't. If he can't help I will get in touch with Jowdy and I have access to a trailer to get it to him. Will post the results. Thanks again.

"Bonus oil" is not a good thing. If you have the stock fuel pump, it might be leaking gas into the case. The pump is pretty easy to replace.

Believe it or not I get 28mgg with my 3.2 Porsche, car weighs 2350. Geared fifth as overdrive. sweet!

Yup - with the new info, it sounds like a defective fuel pump diaphragm leaking gas into the oil sump. Don't forget to change your oil after the pump is repaired.

You might do better than that, Marty. I'm getting 39 mpg highway cruising between 63-65 mph fully loaded.

David---are you using regular gas like Marty?

Giday, Jack. 87 octane...any brand that comes up on the trip. I'm betting Marty will get over 40 mpg highway with a fresh engine and FI.

Well the numbers are in and we saw 34 to 39 mpg on the highway run to Carlisle. The worst we saw was on the assertive drive on our Friday morning run to the 5 covered bridges and that was 24 mpg. Hard to believe.

That is excellent. My own just-under-26 readings tell me I'm still quite a bit on the rich side. Will see about turning some screws this week.

Just ran my numbers. The lowest reading was 32.2 and the highest was 42 mpg. Overall average for the trip was 35.2 on 87 octane fuel. IMHO there's no tuneup quite like a long drive to really clean out the engine and help it to really settle in.

I absent-mindedly reset my trip odometer, and didn't bother to track after that, so I'm just guessing. Last year I averaged 27.5, and this year I had to make fewer fuel stops, so I know I at least matched that. Not bad for an old-tech engine with only 4 gears.

Minor mpg envy with you Suby guys.

If I flog Pearl on back roads I get around 24-25. If I cruise on the interstates, keeping up with whatever traffic (and waving at the ladies who wink and give me "thumbs up!") I get 28-29.

And you SAS guys have another 200-300 pounds on Pearl, too. THAT's pretty good mileage!

Cruising at 75-80mph (cruise control) according to my GPS (Speedo broke) I averaged 32 to 33 mpg. There were occasional blips up to 90-95 or more (?) to pass semis. I did let a couple of curious guys pass after dogging me for miles but passed them while the troopers were writing them tickets.