Motorway/Highway Gas/Petrol Mileage

Post by **HareBall** » 05 Jun 2007, 14:19

damnyankee wrote:25-26 mpg. 95% highway driving at 75mph, 3K rpm.

Never done any better than 26.5 mpg.

What grade fuel are you guys using?

I try to run 93 octane in mine. Sometimes I'm not paying attention and pump regular(87).

McBrain · Post by **McBrain** » 06 Jun 2007, 10:09

Ordinary regular normal. . . . .

Post by **FireFox31** » 06 Jun 2007, 20:27

I just calculated a three month average of 27.4 mile per gallon in my 2000 V70 manual with roughly half highway and half city mileage. That's with 93 octane, US gallon and essentially no load.

I've been doing a test to see if speed effects mpg. For months, I've gone a maximum of 70 mph on highways and 10 miles over the speed limit on other roads. No heavy acceleration, no crazy stop and go traffic.

I think the biggest effect on gas mileage is "summer gas" vs. "winter gas". In the winter, I was happy to get 380 miles in my 18 gallon tank (~21 mpg??). Since March, I haven't gone below 400 miles, with a max of 468 miles on 17 gallons (~27 mpg).

What's the difference between summer and winter gas? Hey, if they want to charge more for gas in the summer, but I get better gas mileage, seems fair to me.

turbotim2 · Post by **turbotim2** » 07 Jun 2007, 05:06

They add ethanol during the summer to lower emissions and help with the smog issues. I have heard many cases of people getting measurably better mileage in the summer, and its cleaner. So why do they not add it during the winter? Thats a question for ExxonMobil!!

Buck380 · Post by **Buck380** » 20 Jun 2007, 21:50

Managed 27 mpg on a recent road trip. Mostly highway and rolling hills.
It's a solid 20 mpg in a mix of highway and street driving I do on regular basis.
Running 91 octane for a few tanks and 87 other time with miniscule differences.
35psi in the tires and a pregnant wife in the passenger seat...

ycmike · Post by **ycmike** » 26 Jun 2007, 09:34

My V70 T5 (161,00 km) gets about 8.7 liters per 100 km. on the highway- on cruise control and 115 km/hr. It's about 9.2 l/100 km in the city, a bit of stop and go and some high speed on the expressway.
I use premium fuel and leave the ECC in Auto.
I find it's much worse in the winter time at around 11.7 l/100km.

Mike

Tsquared · Post by **Tsquared** » 26 Jun 2007, 13:30

turbotim2 wrote:They add ethanol during the summer to lower emissions and help with the smog issues. I have heard many cases of people getting measurably better mileage in the summer, and its cleaner. So why do they not add it during the winter? Thats a question for ExxonMobil!!

Its more than just the summer blend vs. winter blend. In the cooler months the air is denser. You MAF and computer will readjust you timing to keep it from pinging. If you could run the summer gas in winter time your mileage would drop even more. If you could run the winter gas in the summer time you would get better mileage than the summer mix. Metro areas are required by the EPA to run different mixtures for different seasons(thanks to environmentalist weenies in the communist state of Kalifornia for pushing CARB on the rest of the nation). The different blends that are required cost all consumers more money at the pump and for mileage.

Do away with the EPA requirement on gas formulas and concentrate on keeping you vehicle properly tuned would be the best for the environment but it is easier to put the burden on the petrol suppliers. But most people who own a car know nothing about how it works and could care less about optimum tunning...

The ones who do care belong to auto forums to get the most out of their rides.

Tony

"Volvo for life is not an add campaign, it's an obsession"

turbotim2 · Post by **turbotim2** » 28 Jun 2007, 07:46

Tuning is a thing of the past now. Change your filters and spark plugs is about all you can do. The computer takes care of all the timing and fuel mixtures for you.
You can say what you want about the commy environmentalists or whatever but I was just in some heavy traffic around the Boston area and was choking on the fumes, and that was with mostly modern "clean burning" cars around me burning the "clean" commy fuel. I can't imagine what that would have been like 30 years ago.

Helodrv · Post by **Helodrv** » 30 Jun 2007, 11:13

What tire pressures are people using in 850 wagons with the standard 195/60 R15 tires? My fuel door sticker suggest something like 41/36 psi (Front/Rear) for a loaded vehicle and 32/31 psi for a lightly loaded vehicle.

Also, for people who have owned their 850 wagons for a while, what types of tires have worked well? What kind of mileage are you seeing on the tires?

My non-turbo 850 wagon averages 23 mpg city and 27-30 mpg highway, depending on the cruising speeds. The car has 146,000 miles on the odometer. I alternate using the mid-level gas and premium.

I put four Kumho 732 Touring Plus tires on the car shortly after I bought it in January. For an all purpose tire, they seem to be OK. They are comfortable on the highway and handle fairly well. But then, I have not been driving this car very aggressively. I am not sure what the tire life is going to be. The compound seems to be a bit soft. I don't think they will make their advertised 40,000 miles. But for the price, they seem to be a fair buy.

Mel Hughes
Flintstone, GA

ratfink_v70_2000 · Post by **ratfink_v70_2000** » 01 Jul 2007, 14:38

Hi, I get around 31/32 mpg when doing 60/70 on motorway or a class roads here in England/Scotland. Car is a 1999 v70 2.4 xt lpt. We live in Scotland and most of our ' side ' roads are single track with passing places, the speed limit on these is 60 but you seldom get to do it so the fuel consumption drops a fair bit and if we go out on the main roads up here we can go 30 miles or more without seeing another vehicle so we tend put the hammer down a bit which obviously has an effect on the fuel.

Motorway/Highway Gas/Petrol Mileage

Re: 1995 850GLT Non Turbo Auto, 130K