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1968-Present E-Series Van/Cutaway/Chassis Econolines. E150, E250, E350, E450 and E550

Poor MPG

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Old Jul 1, 2018 | 04:38 PM
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Poor MPG

2010 E350, within the last year I had a new Jasper engine put in with new everything. Since then, roughly 10K miles later I notice my MPG absolutely sucks. Maybe getting 8 out of it. 5.4 V8. Any suggestions?

2.5% all the way around on top of the factory rear
 
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Old Jul 1, 2018 | 05:12 PM
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If you rarely see highway mileage then 8mpg is normal.
Tell us about your driving.
 
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Old Jul 1, 2018 | 05:26 PM
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No speeding or hard start,stops. A lot of city and some highway each day.
 
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Old Jul 1, 2018 | 06:43 PM
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How's the tailpipe look? Is it running rich? A vacuum leak or a bad O2 sensor will dump lots of fuel.
 
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Old Jul 2, 2018 | 05:10 AM
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“A lot of city”
8mpg is perfectly normal
 
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Old Jul 2, 2018 | 01:17 PM
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Originally Posted by Im50fast
“A lot of city”
8mpg is perfectly normal
Stop and go traffic will kill your mpg, but still 8 mpg sounds bad for a regular van. Do you carry heavy loads?
Just for reference I have a 2010 extended 5.4 E350 4x4 with 4" lift and 33" tires and I am getting 11 mpg on short "defensive" drives.
 
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Old Jul 2, 2018 | 04:50 PM
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"Maybe getting 8". How did you arrive at this figure? Did you actually calculate your MPG or just guessing?
 
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Old Jul 2, 2018 | 05:01 PM
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My RV on 1990 E350 chassis with a 460 engine gets just over 10 MPG and it's pulling a 31 foot motorhome cabin on 10% ethanol gas.

I'd expect better for a van with a smaller engine.

Steve
 
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Old Jul 2, 2018 | 08:05 PM
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Originally Posted by EagleFreek
"Maybe getting 8". How did you arrive at this figure? Did you actually calculate your MPG or just guessing?

Excellent question. I see a lot of folks on another forum (lots of kids) who don't know how to calculate gas mileage. They think that they can do it with the gas gauge. "Miles between fillups".

Without accurate numbers, you might be chasing a ghost.
 
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Old Jul 2, 2018 | 08:20 PM
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Originally Posted by EagleFreek
"Maybe getting 8". How did you arrive at this figure? Did you actually calculate your MPG or just guessing?
good point.
”maybe” is useless. Calculations are useful.
 
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