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Herman and Operation 30MPG

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.
1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70
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rspi
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Re: Herman and Operation 30MPG

Post by rspi » Tue Feb 13, 2018 9:14 am

How old is the coolant thermostat?


'95 855 T-5R M, Panther - 22/28 mpg
'98 S70 GLT, Lil' Red 25/32 mpg
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WhatAmIDoing
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Re: Herman and Operation 30MPG

Post by WhatAmIDoing » Tue Feb 13, 2018 9:43 am

My mpg record in my manual T5 is 36mpg... all highway, mostly downhill. :lol: That and the 93 octane, low ethanol, midwest gas probably helped. I don't know if the same applies for the NA, but good gas is a must if I want good performance and fuel economy. I normally get 28 highway, 24 country roads, and best I ever did city was 19. Goodluck with your fancy intake.
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callahanoffroad
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Re: Herman and Operation 30MPG

Post by callahanoffroad » Wed Feb 14, 2018 5:11 am

rspi wrote:
Tue Feb 13, 2018 9:14 am
How old is the coolant thermostat?
I honestly have no idea. It was supposed to be changed with the radiator hoses last week, but I couldn't get the bolts off the housing. One of them started to strip, so I backed off untill I could soak it it some bolt blaster.


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abscate
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Re: Herman and Operation 30MPG

Post by abscate » Wed Feb 14, 2018 6:47 am

One of them started to strip, so I backed off untill I could soak it it some bolt blaster.
Nice - Get a good new Torx bit on there and shock it a bit, too.
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Re: Herman and Operation 30MPG

Post by callahanoffroad » Wed Feb 14, 2018 3:22 pm

I was poking around in the engine bay today and I checked the ecu's and it turns out I have the jetronic LH 3.2 system and I wonder if that doesn't have something to do with the bad gas mileage consistently.


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Re: Herman and Operation 30MPG

Post by callahanoffroad » Mon Feb 19, 2018 6:35 am

I wanted to update my thread and happily announce I've gotten Herman up to... 23.43 MPG! Looks like rumors of the pcv affecting MPG were true. Hahaha.

All I have left for a full "stage 0" would be the fuel filter in the line.

Getting an oil change this week and will switch to 10w-30 from 10w-40. Hopefully I'll see a small increase in mpg.

I think I'm going to pull the spare tire out as well see if that makes any difference. I run without anything frivilous in the car to save space already.

Also I fill up about every three days bc of my job. I drive about 500 miles a week. So I'm able to measure changes very quickly!


Annoyed Owner of a Step-Dad Green 1995 Volvo Non-Turbo, with all kinds of weirdness

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