Best Highway Fuel Economy for 3.7 V6??? - Ford Mustang Forum
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post #1 of 33 (permalink) Old 09-02-2013 Thread Starter
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Best Highway Fuel Economy for 3.7 V6???

Hello everyone. I recently took a trip to Thompson International Speedway and averaged 37 mpg traveling I-395 N. I'll admit there were more downhills than uphills and I had my cruise control set at 55 mph, no A/C. The EPA rates the Mustang at 19/31.

But get this- I currently have a 93 Bama Tune, Aluminum Driveshaft, staggered 18" wheels, and AFE cold air intake installed. Automatic. 2.73 gearing. So can anyone/has anyone out there beat 37 mpg highway fuel economy?

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post #2 of 33 (permalink) Old 09-02-2013
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I took a trip from houston to san antonio, about 250 miles and with ac on, me and 3 passengers with cruise set on 65 I averaged about 33mpg. Road is pretty much flat the whole way.


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post #3 of 33 (permalink) Old 09-02-2013
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The computer is never accurate. Unless it's hand calculated those results don't mean a whole lot...
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post #4 of 33 (permalink) Old 09-02-2013
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Seen 34 mpg, easy driving, mostly hiway, never over 65mph.

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post #5 of 33 (permalink) Old 09-02-2013
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The shorter the distance you travel, the less accurate any mpg reading or calculation will be, particularly if road/driving conditions over said short distance are conducive to good mpg. I have eeked 45 mpg out of my car over short distances, but that is never sustainable. I am also less likely to believe the computer over that distance, even though mine is always 1-2 mpg pessimistic.

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post #6 of 33 (permalink) Old 09-02-2013
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Best I have seen was 37.8 that was hand calculated the CPU was reading 36.4... That was bone stock. I imagine if I was going down hill or modified I could hit 39. I was going 75 and all open highway so no having to pass or slow down and flat. I was fairly impressed and on 91 octane

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post #7 of 33 (permalink) Old 09-02-2013
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Quote:
Originally Posted by McCarthy View Post
The computer is never accurate. Unless it's hand calculated those results don't mean a whole lot...
+1 on that. the computer is called a Lie O meter
that being said my lie O meter has me a 29 MPG from Arizona to Wisconsin, doing 65 to 75 most of the way
2.73 rear end and auto trans

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post #8 of 33 (permalink) Old 09-02-2013 Thread Starter
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OK thanks for feedback you all. Still I'm pretty impressed given the performance/efficiency balance of the newer V6's. 0-60 in 5.3 sec, completes quarter mile at a buck and a penny (101 mph) with slight modifications. AND up to 35 mpg real world fuel economy (also with slight modifications). Puts those 4.0 boat anchors to shame in my opinion. I've actually driven one so I know how bad they used to be.
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post #9 of 33 (permalink) Old 09-03-2013
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up to 34 under ideal driving conditions with my 2.73 differential. The highest I've seen with my 3.31 is 29. 28 is typical. My computer reads a tad low. I actually get a bit better if I calculate...less than 1 mpg better....


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Quote:
Originally Posted by BerryBlack37 View Post
. Puts those 4.0 boat anchors to shame in my opinion. I've actually driven one so I know how bad they used to be.
I don't think the 4.0 are bad at all. My old one would hang with this one til 60 and I used to routinely get 29 mpg on highway and occasionally 31-32 with modifications. I think the 3.7 is a Great upgrade but I still appreciate any mustang it's better than everyone driving prii.

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On a 120 mile trip this weekend I got 27, with the cruise set between 80-90, lots of traffic and a few triple digit runs. Bone stock performance pack
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What the dash readout shows at any one point in time is really not relevant, the only relevant number is what it will do over the course of a fillup.

I got 35.7 MPG for a measured fillup running on a totally interstate trip with the cruise set at 67 mph for most of the trip.

I'm sure I could have done quite a bit better at 55, probably 2-3 mpg better at least.

Ford proved the Mustang can get even better than that, they got like 43 mpg or something like that when they set out to do a max fuel economy run at Bristol Motor Speedway, they ran an average of like 47 mph though to do it.

That was with an automatic car, my mileage was with a manual.

For the time I had my V6 manual, my overall MPG average was 29 mpg for all the miles on the car.

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Quote:
Originally Posted by BerryBlack37 View Post
Hello everyone. I recently took a trip to Thompson International Speedway and averaged 37 mpg traveling I-395 N. I'll admit there were more downhills than uphills and I had my cruise control set at 55 mph, no A/C. The EPA rates the Mustang at 19/31.

But get this- I currently have a 93 Bama Tune, Aluminum Driveshaft, staggered 18" wheels, and AFE cold air intake installed. Automatic. 2.73 gearing. So can anyone/has anyone out there beat 37 mpg highway fuel economy?
Very impressive! That's one of the highest MPG's I've heard of one the forums, coming from a long trip that is. Maybe I missed it, but did you try hand calculating the number too?

Shane

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My average MPG over the last 70,000+ miles is just over 30 MPG (total miles divided by total gallons used). The PCM dash MPG always reads LESS than actual (typically around 1 MPG).

I've got an Excell Spreadsheet that I put my miles, gallons, as well as cost per gallon in every week to keep track. Also keep track of "PCM MPG" reading & "Miles to E" at each fill-up and RE-SET the PCM MPG at the beginning of each week as I get on the interstate Monday morning.

Have hit 32.xx MPG about a dozen times, but have yet to break 33 MPG.

Manual & 2.73 Gears
stock 235/50-18 tires @ 36 PSI
91 Octane Ethanol-FREE fuel (since new)
mods:
SCT Bama 91 Performance Tune
AirRaid Cold Air
Dynotech Aluminum Driveshaft

Drive from N-E Wisconsin to Chicago every week (400 miles total)
75% interstate driving @ 75 MPH and cruise on
10-15% 30~45 MPH stop/go
10-15% 60~85 MPH interstate w/o cruise

Doug

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post #15 of 33 (permalink) Old 09-03-2013 Thread Starter
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@AMShaneLesky no hand calculations. But next time I go on a long road trip I'll be sure to compare gallons spent at the pump, at refill to what the CPU is reading and all that good stuff.

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