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The Seer
Original Poster
620 posts
80 months
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2004 5.7 VXR Monaro. I'd like to clear this up since quite frankly it's either me or my car but somethings not right. There's some on here which are saying 300 miles once filled up by the trip computer. Mine tells me 240, and that's the very maximum it reads. But I always find really no more than 180-200 max per tank. And this is what really sticks in the throat, I'm seriously not driving it very hard all the time. Ok a bit of a blast on the dual carriage here and there but a majority is spent with mixed driving, a fair amount being easy driving and using 6th gear around fifty miles an hour! I'll admit I don't use it for motorway journeys. The only motorway journey I have done is when I bought the car, circa 235 miles and even then I used 6th, kept it steady between 65-80 and it used a tank and a half! I can't figure why with driving the car easily and normally (most of the time) I'm getting such low mpg. Ten quid see's no more than twenty miles. A very confued Monaro owner. 
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Tattooboy
4,925 posts
47 months
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70 litre tank = 15 odd gallons, around town driving 18 Mpg around 270 miles tops, the joys of owning a V8 I'm afraid. Only long motorway journeys will you see a decent mpg return
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lastmin8264
405 posts
19 months
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If its been properly serviced recently get it rr to check things are ok
But they do like a drink, some people post about the max range and mpg I do short journeys daily driver and get 16mpg, just done a round trip from mcr to monkfish all motorway a few hundred miles and was 26iirc and that's the best I ever saw. They are what they are, get it on a rr if the bhp is as expected then its just live with it. If bhp down you may need to start looking at faults messing up the mpg. These are not French hatches they use lots of petrol mate.
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ARAF
11,568 posts
92 months
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It may just be your driving style, or the fact that you're doing short journeys.
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leigh1050
842 posts
34 months
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007 VXR
51,429 posts
56 months
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reset the trip computer and try again 
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The Seer
Original Poster
620 posts
80 months
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Tattooboy said: 70 litre tank = 15 odd gallons, around town driving 18 Mpg around 270 miles tops, the joys of owning a V8 I'm afraid. Only long motorway journeys will you see a decent mpg return I'm seeing 11-15 round town, plus I don't get why it took two and a half tanks to cover circa 235 miles when I drove it home on the day of purchase. If I nailed it all the time, I'd say fair enough. It's like it's got the efficency of a classic V 8 engine.
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The Seer
Original Poster
620 posts
80 months
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lastmin8264 said: If its been properly serviced recently get it rr to check things are ok
But they do like a drink, some people post about the max range and mpg I do short journeys daily driver and get 16mpg, just done a round trip from mcr to monkfish all motorway a few hundred miles and was 26iirc and that's the best I ever saw. They are what they are, get it on a rr if the bhp is as expected then its just live with it. If bhp down you may need to start looking at faults messing up the mpg. These are not French hatches they use lots of petrol mate. Yeah, was planning on visiting the dyno soon enough. Doesn't feel odd or sluggish, doesn't smell of a rich mixture. Although can be slightly smokey when at times. More of a light grey smoke than darker or black.
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The Seer
Original Poster
620 posts
80 months
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007 VXR said: reset the trip computer and try again Gonna have to be, but pay day isn't for another few days and me and the car have drunk all our money already!
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ARAF
11,568 posts
92 months
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Next time you stop, check that none of the wheels is hotter than the rest.
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The Seer
Original Poster
620 posts
80 months
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ARAF said: Next time you stop, check that none of the wheels is hotter than the rest. Surely I'll be able to feel if there was some hinderance from the braking system? Nothing so far has alerted me to it, no suspicous feedback etc. But yes maybe worth a go.
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007 VXR
51,429 posts
56 months
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The Seer said: 007 VXR said: reset the trip computer and try again Gonna have to be, but pay day isn't for another few days and me and the car have drunk all our money already! snowwolf had this problem  but he had not reset the trip for over 10k miles so no matter how slow he drove he could not get any better mpg;) reset it and go for a motorway run.
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The Seer
Original Poster
620 posts
80 months
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leigh1050 said: On WOT my immediate MPG reads 3. I'm guessing this is perfectly normal?
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007 VXR
51,429 posts
56 months
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The Seer said: leigh1050 said: On WOT my immediate MPG reads 3. I'm guessing this is perfectly normal? mine reads 30 to 40 at 80mph 
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fildigger
1,076 posts
74 months
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007 VXR said: mine reads 30 to 40 at 80mph Dito...on the instant reading (does fluctuate a lot dependent on the merest of throttle inputs!)....had the car a week, done around 500 miles in her and averaging 25mpg (50% dual carriageway in that) Ps. going on my local scoobies Dyno' Day this sunday....see what the BHP and AFR readings are like.
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ARAF
11,568 posts
92 months
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The Seer said: ARAF said: Next time you stop, check that none of the wheels is hotter than the rest. Surely I'll be able to feel if there was some hinderance from the braking system? Nothing so far has alerted me to it, no suspicous feedback etc. But yes maybe worth a go. You've got over a tonne and a half of metal and one of the torquiest engines currently fitted in a car, so don't bank on it.
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V88Dicky
4,570 posts
52 months
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The Seer said: I'm seeing 11-15 round town, plus I don't get why it took two and a half tanks to cover circa 235 miles when I drove it home on the day I purchased it. 2.5 tanks to do 235 miles!  That's over 37 gallons and <6.5 mpg
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The Seer
Original Poster
620 posts
80 months
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V88Dicky said: The Seer said:
I'm seeing 11-15 round town, plus I don't get why it took two and a half tanks to cover circa 235 miles when I drove it home on the day I purchased it. 2.5 tanks to do 235 miles! That's over 37 gallons and <6.5 mpg Sorry, my mistake it was a tank and a half.
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The Seer
Original Poster
620 posts
80 months
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007 VXR said: The Seer said: 007 VXR said: reset the trip computer and try again Gonna have to be, but pay day isn't for another few days and me and the car have drunk all our money already! snowwolf had this problem but he had not reset the trip for over 10k miles so no matter how slow he drove he could not get any better mpg  reset it and go for a motorway run. I think this could have something to do with it. I haven't reset it and it's possible it hasn't been reset for sometime.
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BlueDevil
270 posts
73 months
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I'm averaging between 27 - 31mpg in my dd and do about a 50 mile round trip mixture of A roads and occasionally motorway, but mines a CV8 so different ratios
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