Miles to full tank

[NordicCrankShaft]

Not that I'm overly bothered as this car is about enjoyment so I normally just fill up, drive, empty and repeat. But the last few days with the nice weather I've used it quite a bit.....3 fuel stops to be precise.

Now bearing in mind, I normally won't let it drop below a 1/4 of a tank as I don't trust the guage, then when I fill it up it won't go past 3/4's.
So yesterday I let it run down to halfway between a 1/4.......looks like I got 159 miles to the fill up, is this normal?

I'm only using Shell Vmax if that makes any difference.

[Zeb74]

I'm on the continent, so we are used to count in volume per distance and not the other way.
I usually expect (conservatively) to burn around 20 litres per 100 miles (yes it's a RHD Chimaera).
It's equivalent to 22.5 mpg.
With a real 3/4 of tank, you should fill up 40 litres. And that's why I'm usually stopping for petrol after 200 miles and avoid to go beyond 250.
Are you measuring your 3/4 with the gauge?

[sixor8]

If the gauge is only going up to 3/4 when full, it's under-reading quite a lot. It's not a big tank, 57 litres, but you should get 200 miles (which would still be under 18 mpg) unless you really cane it in every gear, or are on a track day.

On a long journey in my last Chimaera, I'd get 250 miles cruising. I've had 5 x TVRs and only the Cerbera 4.5 was regularly under 20 mpg.

[NordicCrankShaft]

I can take 200 miles but at 160 it just feels like I'm visiting Shell more than I'd like!

The sender is a bit of a swine to change isn't it?

[Bowks]

We did some spirited driving in Europe last year and managed to empty the tank in just over an hour!

[blaze_away]

You might have an overfueling issue. It's quite common on these cars.

Causes are various but easiest way to see where thongs are at is to log some data via RoverGauge. Do you have that ?

[Zeb74]

Bowks said:

We did some spirited driving in Europe last year and managed to empty the tank in just over an hour!

Oh god!

[NordicCrankShaft]

blaze_away said:

You might have an overfueling issue. It's quite common on these cars.

Causes are various but easiest way to see where thongs are at is to log some data via RoverGauge. Do you have that ?

I do have RoverGauge. Having said that, it was 12k serviced a month or so ago, I'd assume this would've been picked up during that? As this has been the case with the fuel since I've had it (mid July).

[Belle427]

NordicCrankShaft said:

blaze_away said:

You might have an overfueling issue. It's quite common on these cars.

Causes are various but easiest way to see where thongs are at is to log some data via RoverGauge. Do you have that ?

I do have RoverGauge. Having said that, it was 12k serviced a month or so ago, I'd assume this would've been picked up during that? As this has been the case with the fuel since I've had it (mid July).

A basic service would not check this if the car was running ok.

[Loubaruch]

Your fuel consumption is excessive unless your right foot is always really heavy

I average between 24-28 mpg in my Griffith 500 on decent runs but have long since abandoned seat of the pants driving. So expect at least 250 miles on a full tank.

[NordicCrankShaft]

Definitely not overly heavy footed. I've done mostly motorway miles the last few days cruising at around the 65 mark.

It doesn't need it yet but next fuel full up I'll see how much goes in before it clicks off.

[blaze_away]

OK now we know that I'll send you a pm so we can hook up by email as I need to send you a pdf on how the data needs to be logged. Once we have the data I can then analyse it for you to see if we can identify what's going on

[The Three D Mucketeer]

My Chim tank takes about 54 litres a bit more than my Tuscan 51 litres ....I just fill both when they are thirsty
Big difference between town driving and a constant 70 mph

[pmc_3]

The gauge on my 94 Chim under reads. It shows full on the gauge when I fill it up, but I've drained the tank with the fuel light on there was still 20 litres in it. I'd prefer it to under read like it does than over read!

[PabloGee]

The gauge on mine absolutely flies through the first half, then moves notably slower through the second half.
I also noticed that below 1/4 full, taking a spirited right turn makes the gauge drop, and an equally spirited left turn pushes it up!
If there are baffles inside the tank, they wouldn't be along the bottom anyway, so there's a bit of slosh.

I tend to refill around 200-230 miles, though I once was telling myself I had at least another 20 miles in the tank and ran out. Thankfully I was a 10 minute walk from home, so could deal with it. I must have been driving like Miss Daisy's hot granddaughter between fills...