Increase in mpg

peelaaa · 14th May 2018, 11:27

For as long as I can remember my car has been averaging 44-45mpg. Last week I filled up in a different garage than I normally use. Brimmed car yesterday and I calculated 51 mpg.

Car had been driven over 650 miles before fill up and driven on same route as before.
Can fuel be that different in garages??

humphshumphs · 14th May 2018, 11:37

This could open a can of worms (again)..... I used to fill up my diesel with supermarket, and averaged 34/35 (automatic), but had some issues with a couple of fillups (in different supermarkets in town), so changed to 'proper' fuel - and now see 39/40mpg.

In our now gone Freelander, again used supermarket petrol, and again had issues, so changed to 'proper' petrol - didn't improve the mpg, but ran a hell of a lot better.

Only use 'proper' fuel in my CDT and in the new MG ZS we've just bought. My father (who does next to no mileage at all in a 45) also changed from supermarket fuel and is getting better mpg and the car runs better.

So, whilst some people will say there is no difference in the fuels, from my experience there is

clf · 14th May 2018, 11:43

Short answer is yes.

My monthly use of the car has next to no variation. Going from 'go' and tesco fuel to maxol, saw an increase in mileage from 420 ish to 450. As well as a noticeable increase in responsiveness.

You will also notice a slight increase due to ambient temps too. When I changed it was coming into winter but overall I reckon the weather to be worth 5 to 10 miles per fill. My father who like me didn't believe it would happen even commented on how his car seemed to perform better and get better mpg with branded fuel.

Some will disagree, and years gone I would have too, but I was pleasantly surprised. The super diesel from branded fuel companies though, I didn't notice any difference.

Sent from my SM-A310F using Tapatalk

Dansrockin · 15th May 2018, 13:58

In my various v6s, ive found that using a premium fuel such as momentum, optimax etc, gives around 20-30 miles a tankful more than the basic 95ron petrol. I've not found too much difference on my cdtis, apart from being slightly smoother.
However, I have recently noticed that my fuel economy has improved by the time of around 30 miles a tankful in my 190, and close to 50 miles in my cdti. The only thing different that has happened in the last couple of months that I've noticed is the weather has got warmer.

klarzy · 15th May 2018, 14:35

Quote:

Originally Posted by peelaaa

For as long as I can remember my car has been averaging 44-45mpg. Last week I filled up in a different garage than I normally use. Brimmed car yesterday and I calculated 51 mpg.

Car had been driven over 650 miles before fill up and driven on same route as before.
Can fuel be that different in garages??

difference in air temp, pressure and humidity have a small effect, but not doing cold starts from sub zero help a lot too...

bl52krz · 15th May 2018, 20:47

Quote:

Originally Posted by Dansrockin

In my various v6s, ive found that using a premium fuel such as momentum, optimax etc, gives around 20-30 miles a tankful more than the basic 95ron petrol. I've not found too much difference on my cdtis, apart from being slightly smoother.
However, I have recently noticed that my fuel economy has improved by the time of around 30 miles a tankful in my 190, and close to 50 miles in my cdti. The only thing different that has happened in the last couple of months that I've noticed is the weather has got warmer.

And you just answered your own question. It’s warmer. Some people do not believe it. Those that don’t:- put 5 litres in a five litre can, and don’t put the top on. Tell me it did not overflow. Best time to fill up.............."...in the morning when it is still cooler.

14th May 2018, 11:27	#1
peelaaa Posted a thing or two 75 cdti 2004 contemporary Join Date: Apr 2008 Location: meath Posts: 1,551 Thanks: 272 Thanked 80 Times in 58 Posts	Increase in mpg For as long as I can remember my car has been averaging 44-45mpg. Last week I filled up in a different garage than I normally use. Brimmed car yesterday and I calculated 51 mpg. Car had been driven over 650 miles before fill up and driven on same route as before. Can fuel be that different in garages??

14th May 2018, 11:37	#2
humphshumphs I really should get out more....... No longer a Rover Owner Join Date: Jan 2011 Location: As far east as you can go in the UK and not get wet feet. Posts: 2,273 Thanks: 404 Thanked 309 Times in 246 Posts	This could open a can of worms (again)..... I used to fill up my diesel with supermarket, and averaged 34/35 (automatic), but had some issues with a couple of fillups (in different supermarkets in town), so changed to 'proper' fuel - and now see 39/40mpg. In our now gone Freelander, again used supermarket petrol, and again had issues, so changed to 'proper' petrol - didn't improve the mpg, but ran a hell of a lot better. Only use 'proper' fuel in my CDT and in the new MG ZS we've just bought. My father (who does next to no mileage at all in a 45) also changed from supermarket fuel and is getting better mpg and the car runs better. So, whilst some people will say there is no difference in the fuels, from my experience there is __________________ Richard. No longer a 75 owner as my tourer made it to the moon, and died on it's way back. But 1/4 million miles ain't bad.

14th May 2018, 11:43	#3
clf This is my second home MG ZT CDTi Join Date: Jan 2014 Location: carrick Posts: 7,859 Thanks: 3,494 Thanked 2,657 Times in 1,973 Posts	Short answer is yes. My monthly use of the car has next to no variation. Going from 'go' and tesco fuel to maxol, saw an increase in mileage from 420 ish to 450. As well as a noticeable increase in responsiveness. You will also notice a slight increase due to ambient temps too. When I changed it was coming into winter but overall I reckon the weather to be worth 5 to 10 miles per fill. My father who like me didn't believe it would happen even commented on how his car seemed to perform better and get better mpg with branded fuel. Some will disagree, and years gone I would have too, but I was pleasantly surprised. The super diesel from branded fuel companies though, I didn't notice any difference. Sent from my SM-A310F using Tapatalk __________________ It is not gloss primer .............. it is duct tape silver!

15th May 2018, 13:58	#4
Dansrockin Posted a thing or two MG ZT number 1 of 25 celestial!! Join Date: Feb 2012 Location: Banbury Posts: 1,967 Thanks: 208 Thanked 242 Times in 166 Posts	In my various v6s, ive found that using a premium fuel such as momentum, optimax etc, gives around 20-30 miles a tankful more than the basic 95ron petrol. I've not found too much difference on my cdtis, apart from being slightly smoother. However, I have recently noticed that my fuel economy has improved by the time of around 30 miles a tankful in my 190, and close to 50 miles in my cdti. The only thing different that has happened in the last couple of months that I've noticed is the weather has got warmer.