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Getting only 15-16 MPG combined driving...

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70
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TheLoneAviator
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Year and Model: V70 1998 AWD
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Re: Getting only 15-16 MPG combined driving...

Post by TheLoneAviator »

I call it the "Stuff Hitting the Fan" stage 2. Otherwise known as the "Short Term Fuel Trim".
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E Showell
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Post by E Showell »

Notice I didn't say WTF is STFT. . .?
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (sold)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic (sold)
'04 XC70 Ruby Red Metallic (sold)
'95 855 auto (sold)
'86 245 manual (sold)
'05 V70 T5 M (totalled)
'06 V70 FWD Auto (totalled)
'02 Honda Insight CVT
‘04 Honda Insight CVT — “Yesterday’s car of tomorrow” (sold)
‘06 Honda Insight CVT
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TheLoneAviator
Posts: 63
Joined: 14 August 2014
Year and Model: V70 1998 AWD
Location: Texas
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Post by TheLoneAviator »

Vac line was apparently knocked off last time I was under the hood-cause of the High STFT reading. That's fixed.
Changed the front O2 to try to resolve the bad gas mileage. I'll bet that takes care of it.
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TheLoneAviator
Posts: 63
Joined: 14 August 2014
Year and Model: V70 1998 AWD
Location: Texas
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Post by TheLoneAviator »

After driving 90 miles commuting,
avg speed = 27mph
Sport Mode
AC ON
91 gas
I still am getting 15mpg.
I guess that's about it.
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E Showell
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Post by E Showell »

Something is definitely wrong. Under similar average commuting stop and go with a non-turbo 5 speed, I get 25 mpg plus. Manuals may be a bit stingier than autos, but no way is it worth 10 mpg.
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (sold)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic (sold)
'04 XC70 Ruby Red Metallic (sold)
'95 855 auto (sold)
'86 245 manual (sold)
'05 V70 T5 M (totalled)
'06 V70 FWD Auto (totalled)
'02 Honda Insight CVT
‘04 Honda Insight CVT — “Yesterday’s car of tomorrow” (sold)
‘06 Honda Insight CVT
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TheLoneAviator
Posts: 63
Joined: 14 August 2014
Year and Model: V70 1998 AWD
Location: Texas
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Post by TheLoneAviator »

I may have to take it in for a diagnostics.
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E Showell
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Post by E Showell »

And my results are with 89 octane, and perhaps sometimes even 87. I have a hilly c. 30 mile commute with 20 stoplights and still manage 25+ mpg, but I don't have AWD. I can't believe the AWD is a massive mileage suck.
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (sold)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic (sold)
'04 XC70 Ruby Red Metallic (sold)
'95 855 auto (sold)
'86 245 manual (sold)
'05 V70 T5 M (totalled)
'06 V70 FWD Auto (totalled)
'02 Honda Insight CVT
‘04 Honda Insight CVT — “Yesterday’s car of tomorrow” (sold)
‘06 Honda Insight CVT
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abscate  
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Post by abscate »

I drove a 2004 XC and a 2005 manual FWD on identical highway routes this summer and saw 26 mpg on the LPT and 34 mpg on my stick. Meanwhile my T5 stick gets 28 mpg on that route. AWD might account for 4 mpg of the delta at most, and only 2 mpg if I compare the two turbo cars
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1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 XC90-in-Red
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E Showell
Posts: 3275
Joined: 16 October 2008
Year and Model: ‘07 S80 3.2
Location: Long Valley, N.J.
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Post by E Showell »

To loneaviator -- nix the sport mode and see how you do on mpg.
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (sold)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic (sold)
'04 XC70 Ruby Red Metallic (sold)
'95 855 auto (sold)
'86 245 manual (sold)
'05 V70 T5 M (totalled)
'06 V70 FWD Auto (totalled)
'02 Honda Insight CVT
‘04 Honda Insight CVT — “Yesterday’s car of tomorrow” (sold)
‘06 Honda Insight CVT
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regent
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Post by regent »

I've noticed a drastic improvement in efficiency when I disable the 'sport mode' on the device located between the seat and the steering column... :o
Example of Precision: Measure with a Micrometer, mark it with Chalk, and then cut it with an Axe.
Disclaimer: We (very) seldom do that

2015 BMW 335i
2015 XC60 T5 Premier Plus
2002 S60 2.4 n/a - retired :(
1987 340 DL - retired :(
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