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Author Topic:   Lousy MPG
70SportsRoof
Gearhead

Posts: 901
From: Orange County, CA
Registered: Dec 2001

posted 10-09-2002 02:55 PM     Click Here to See the Profile for 70SportsRoof   Click Here to Email 70SportsRoof     Edit/Delete Message   Reply w/Quote
Okay, help give me some clues on why my mileage has gone down dramatically in the last few weeks. The car is my '70, 351W, Carter 625, Edelbrock Performer manifold, dual exhaust, mild cam, rebuilt FMX w/ higher stall converter. Lately it seems I get about 8-10 miles to the gallon on the street. Before I would get better mileage. I'm going to be changing the plugs and wires soon, since they need to be done anyway. I've got the timing set well. I do know that the floats are a little off in the carb, which I will be rebuilding this weekend. But will all of this get me back some better mileage? I know I can't really good mileage from this car, but damn, spending all that money on gas every week is a real PITA! Anybdy have any suggestions?

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Gary M.-
1970 Mustang Deluxe SportsRoof (daily driver), 1946 Ford pickup, 1947 Ford pickup, 1957 Ford Fairlane 500 Town Vic

[This message has been edited by 70SportsRoof (edited 10-09-2002).]

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fordnmerc
Gearhead

Posts: 1001
From: Watkins Glen NY USA
Registered: Mar 2002

posted 10-09-2002 03:01 PM     Click Here to See the Profile for fordnmerc   Click Here to Email fordnmerc     Edit/Delete Message   Reply w/Quote
Go through much dust lately, there in AZ?

Air filter....?

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David

Spread Joy. Less cholesterol than butter!

1978 LTD II 2 Door
1979 Ranchero GT

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70SportsRoof
Gearhead

Posts: 901
From: Orange County, CA
Registered: Dec 2001

posted 10-09-2002 03:05 PM     Click Here to See the Profile for 70SportsRoof   Click Here to Email 70SportsRoof     Edit/Delete Message   Reply w/Quote
Not much dust here right now. The filter is a few months old, but is still nice and clean. Even when I had the old filter and it was dirty I got better mileage. I'm kinda thinking carb probs, since I know that the floats need adjustment. Anybody else agree?

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Gary M.-
1970 Mustang Deluxe SportsRoof (daily driver), 1946 Ford pickup, 1947 Ford pickup, 1957 Ford Fairlane 500 Town Vic

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johnmustang
Gearhead

Posts: 5818
From: British Columbia , Canada
Registered: Nov 2001

posted 10-09-2002 03:20 PM     Click Here to See the Profile for johnmustang   Click Here to Email johnmustang     Edit/Delete Message   Reply w/Quote
I would say carb problem as well , had the same with my car , MPG sucked , had a guy rebuild the carb for me ( 52 year ford mechanic , carb specialist )After he was done with it My MPg went up to 15 . Autolite 4100 1.08 venturi. MPG was at about 7-9.

JOHN

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65 2+2 FASTBACK
68 COUPE
87 TAURUS WAGON
98 F150 XLT TRITON V8 4.6, 4 WHEEL DRIVE
Member:Vancouver Island Mustang Association
M&M #1710
MyPhotoPage
MY TRUCK

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Dave Gibson
Moderator

Posts: 8887
From: Norfolk, Virginia, USA M&M#166 MCA#47921
Registered: Aug 99

posted 10-09-2002 05:40 PM     Click Here to See the Profile for Dave Gibson   Click Here to Email Dave Gibson     Edit/Delete Message   Reply w/Quote
Gary,
If you know that the floats aren't right, I would start there. A good tune up never hurt either. Have fun this weekend and keep us posted on the results.

Dave & Terri

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Poison Ivy (Dave's)
'65 Fastback Modified 289 4V, C-4, dual exhaust, styled steel wheels, rally pac, A/C
'02 Explorer XLT, Black, 3.73:1 limited slip, class III tow package!

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V8 Thumper
Gearhead

Posts: 4376
From: Arizona
Registered: Dec 2001

posted 10-09-2002 06:37 PM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
Checked your tire pressures lately? Cooler ambient tempature makes for lower tire pressures, especially if you last filled them while hot. Lower pressures = more drag, which requires more right foot

Don't feel bad; my 333 only gets 8-9 mpg

Seriously

It's an E ticket ride, though

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