Real world MPG

[EmmaJ]

OK as a bit of fun I've been logging my fill ups and mileage to see just how far out the fuel computer is. Let's just say it's nowhere close

So I started logging my fill ups when I drove up to the National meet and ever since I've covered 1309 miles used 384.06l of Shell's finest unleaded at a cost of £533.04 in a grand total of 9 days....

My best MPG for a single fill up was: 21.95
My worst MPG for a single fill up was: 13.28
Giving an average MPG thus far of: 16.66

So anybody else care to share what they are seeing MPG wise in the real world using the brim to brim method or a fuel app?

[KMud]

I assume you're running bigger injectors? I think my computer is fairly accurate. It's interesting to reduce the MPG smoothing (in EFI live) to see a more instantaneous estimate. You do get about

I've done 6054 miles, using 330.9 Gallons, so ~18.1 MPG, but I've gone as low as 12.7 MPG on a full tank.

[Xpuffin]

I managed a best of 21.2 over a tank full driving Miss Daisy.
And a worst of 3.1 at Thunder Road when I did the taxi runs. (18ish runs back to back)

[anonymous-user]

I average about 15mpg.

[Monaro5.7]

Town driving 8-12mpg
long run 23mpg

Worth every penny

[slippery]

I averaged 19.3 over 30k miles.

[ringram]

~24mpg over thousands of miles, mostly motorway though.

Ill get a good test in going to sweden, I think I posted the results from that up last year.

[EmmaJ]

KMud said:

I assume you're running bigger injectors?

Yeah just a tad bigger than standard

[fastbikes76]

In the R8 I found the trip meter is bang on with mpg.

Driving to France 4up with boot full we averaged 27mpg door to door sitting at 80ish. Recent trip to Cornwall we averaged 24mpg, around town however where most our driving is we getting 17-18ish

Stock R8 with de-cat, WP cat back and K&N filter .

[SturdyHSV]

On the power tour, I did 700 miles and used 136 litres, so 23.4MPG.

What's odd, is the car had this information, and yet insisted I had done 24.9.

This included a fair bit of idling / queueing, some country blasts, lots of motorway at various speeds, and of course quite a few burnouts and 1/4 mile runs, so probably a fairly representative mix.

Drove like miss daisy coming home as I refused to fill up again (under 2 tanks) and the old lump did well, with a sat nav estimate of 162miles to go, the range said 160. By the time I got home, I had 24 miles left, so easily another gallon

When I filled it up next, my distance to empty was 410miles. Needless to say, that estimate was wrong

[Granby]

EmmaJ said:

OK as a bit of fun I've been logging my fill ups and mileage to see just how far out the fuel computer is. Let's just say it's nowhere close

So I started logging my fill ups when I drove up to the National meet and ever since I've covered 1309 miles used 384.06l of Shell's finest unleaded at a cost of £533.04 in a grand total of 9 days....

My best MPG for a single fill up was: 21.95
My worst MPG for a single fill up was: 13.28
Giving an average MPG thus far of: 16.66

So anybody else care to share what they are seeing MPG wise in the real world using the brim to brim method or a fuel app?

What was the dash mpg reading as mine is about 2 mpg lower than it actually is, i was wondering if this can be adjusted for the bigger injectors?

[EmmaJ]

Granby said:

EmmaJ said:

OK as a bit of fun I've been logging my fill ups and mileage to see just how far out the fuel computer is. Let's just say it's nowhere close

So I started logging my fill ups when I drove up to the National meet and ever since I've covered 1309 miles used 384.06l of Shell's finest unleaded at a cost of £533.04 in a grand total of 9 days....

My best MPG for a single fill up was: 21.95
My worst MPG for a single fill up was: 13.28
Giving an average MPG thus far of: 16.66

So anybody else care to share what they are seeing MPG wise in the real world using the brim to brim method or a fuel app?

What was the dash mpg reading as mine is about 2 mpg lower than it actually is, i was wondering if this can be adjusted for the bigger injectors?

Off by at least 6MPG which is totally misleading, 10% you could perhaps forgive but not that much

I'll do a proper test and reset it for the next tankful to get a true like for like comparison

[Ian350]

I got between 18.5 and 19.0 in a 6.0 VXR over a 1000 mile period. This was mostly commuting via A roads and country lanes with a bit of stop start, plus the usual weekend takeaway collection blast! No motorway use though.

[Wyld Stallyn]

Running 18.1 MPG over 1k

[Codswallop]

Personal best was just over 36mpg worked out tank to tank.

http://www.pistonheads.com/GASSING/topic.asp?h=0&a...

Current long term average is around 22mpg over several thousand miles including lots of motorway, city driving, hooning and track work. Mainly I just keep my head in the sand though and just put petrol in without looking at the fuel pump display. Ignorance is bliss

[V88Dicky]

Average about 24, worst I've seen is 18, best was 31.8 on for a 380 mile trip. Got there without filling up, too!

[vxr2010]

Monaro cv8 29.5 mpg Enfield to Edinburgh less than one tank of petrol and petrol light did not even come on , went to a 3.9 diff and would not be able to do the same , mainly motorway plus some A roads and some start stop too , at 70 to 75 mph

[Yertis]

vxr2010 said:

Monaro cv8 29.5 mpg Enfield to Edinburgh less than one tank of petrol and petrol light did not even come on , went to a 3.9 diff and would not be able to do the same , mainly motorway plus some A roads and some start stop too , at 70 to 75 mph

That's about the best I've had too. Overall average is about 25mpg, but I do alot of motorway miles in the Monaro and not much else.

[Vauxhallman]

Lol, mine (LS2 R8) gets an easy life. My best was 29.8 on a 200 mile journey, but I regularly get 25-27mpg on my 34 mile commute (30 of which is motorway), that's just keeping up with traffic in the outside lane. Lowest over a tank was 23.4mpg.

[007 VXR]

Mines 21/22mpg But i dont do much town/traffic driving