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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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  #1  
Old 07-18-2007, 07:48 PM
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MPG 302 vs 351

I have a 95 F-150, 302, ext.cab with a 4r70w trany and 3.55 LS rear end. I am thinking about doing an engine swap to a 351 and was wondering what kind of gas mileage I would be sacrificing? I am currently averaging 14 (city) and 18 (highway).



Iím also wondering if the 4r70w will handle the 351. I only tow around 3000 to 4000 lbs. and I really donít drive like Iím in a race care, well unless someone pisses me off.
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Old 07-18-2007, 07:59 PM
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You won't sacrifice any gas mileage worth talking about...


The only thing is that the shift points for that 302 would be different for the 351 and it may not be optimal....and may not allow you to take full advantage of the 351's low end torque.


Since the 351 makes a lot more low end torque, it can use less rpm at less of a load to propel the truck, which saves mileage. Since it is a larger displacement, it will use more fuel in general, but the two usually cancel each other out and end up somewhere around the same mileage.
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Old 07-18-2007, 10:25 PM
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Of course with that extra torque, you're more likely to use it to get off the stoplights and there goes the mileage. I hate it when that happens
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Old 07-19-2007, 07:12 AM
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Best I ever got with my 302 was 17mpg on an extended trip. The best my 351 has done to date is 14mpg. The difference could be that the 302 was hooked to 3.55s and the 351 has a 4.10 behind it (and weighs a whole bunch more as a truck).

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Old 07-19-2007, 08:30 AM
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Quote:
Originally Posted by dverkest
I am currently averaging 14 (city) and 18 (highway).
I get close to those numbers with my combination, 13-14 combined city, 17-18 strictly highway.
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Old 07-19-2007, 07:01 PM
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Depending on your area . Hills etc.

I have had 6 351's and just got rid of 96 F150 reg cab. Was really nice truck but 12 MPG didn't cut it.

Just subtract 4 MPG and you got it.I live in hilly area (Up state PA). I never got above 13 MPG on any 351 with 3:55 rears and i have all records. Even out west

My 94 F150 4x4 longbed SC 302 gets 14-17 MPG all time (with 300 LBS tools)and hauls just fine . If you haul but once a week its not worth the MPG loss. Ive had 10 302 and its all I run now. I haul a 22Ft car trailer. I'm slow on day I haul but just as fast rest time.

Hey just depends on you and needs ,I drive 500-1000 a week and even 2 MPG adds up.
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Old 07-19-2007, 08:15 PM
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Here's my experience, in 2000 I bought a 1992 E150 conversion (no seats though) with a 351w and an E4OD (.73:! overdrive) and a 3:55 rear end. I got 17mpg highway and 14 city consistently. My father bought a 1988 E150 clubwagon XLT 302/AOD (.67:1 overdrive), 3:55 rear end. It weighs in at about 5k pounds empty. It gets 14mpg in town, and 16 on the road. Towing the 351w got about 12 in the flats, 8 to 10 in the hills. The 302 gets 10 everywhere while towing.
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Old 07-19-2007, 08:22 PM
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i have a 92 f150 2wd, with a 351w,e4od trans, and 373 gear the best i average is around 13 mpg in the city.
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Old 07-19-2007, 08:31 PM
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Yeah in my 1993 F150 with the 351W gets im guessing about 15-16 mpg city at least maybe a bit less but i can go almost a full two weeks on one tank no joke but thats keeping it under 2000 rpm which seems hard but not that bad and i got the 3.55 rear
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My Truck:
1993 F150 XLT Reg cab Long box 351 (5.8L) E4OD 2wd 3.55 non limited slip axle factory ten hole aluminum rims

Dad's Truck:
1992 F150 XLT Supercab Short box 302 (5.0l) E4OD 2wd 3.55 non limited slip axle factory five star wheels

2006 F150 XLT Supercrew 5.5ft box XTR 5.4l 4R75E 3.73 LS 4x4
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Old 07-19-2007, 10:07 PM
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Bone stock 302 in my truck with 3.55 gears on OEM rubber: 14 City/mixed driving, 18 strictly highway

Mild build 306 with 4.10 gears turning 33" tires: 13-14 city/mixed driving, strictly highway 18+ mpg.

I religiously check my mpg each fill up. I use the same pump at the same station etc. The best I've seen on the 306 was 21 mpg. This was driving from California to Washington (zero city miles) with no lift, 30" tires and a 3.55 rear end. Also, this was on premium fuel and the timing was set at 18* BTDC.

The best tank I've gotten with my current setup at 13* and 87 pump gas is a hair shy under 19 mpg.
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  #11  
Old 07-20-2007, 12:18 AM
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The mileage all comes down to what gearing. My '87 F150 302 T18 only gets 12 mpg if I'm nice to it, but my grandfathers '94 F250 5 spd gets 16 highway and 13 city.
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Old 07-20-2007, 12:18 AM
 
 
 
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Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1987 - 1996 F150 & Larger F-Series Trucks

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