Wonga Spar Posted June 8, 2018 Share Posted June 8, 2018 I've just blown my entire NA-T fund on a mortgage deposit and unfortunately my new commute to work is a 50 mile round trip. MPG is now king, is there anything I can do/buy/install that would dramatically help MPG? No suggestion is too outlandish, I'm even thinking fitting an ECU and getting an MPG focused map might be an answer, would love any insights on this. Has anybody fitted an MPG gauge before? There seems to be a few available but I'm slightly dubious of their effectiveness. Any and all help with this would be massively appreciated, I really don't want to have to buy a second 'sensible' car! Quote Link to comment Share on other sites More sharing options...
jackso11 Posted June 8, 2018 Share Posted June 8, 2018 Only thing I can think of that would dramatically increase you mpg is something like a Hyundai i10. Mpg is not something you can worry about with a supra I’m afraid. They are not made to be a fuel efficient car. Quote Link to comment Share on other sites More sharing options...
Mk4Gaz Posted June 8, 2018 Share Posted June 8, 2018 Buy a prius and fit a supra body kit Quote Link to comment Share on other sites More sharing options...
jackso11 Posted June 8, 2018 Share Posted June 8, 2018 I just noticed you said has anyone fitted an mpg gauge and wondered about effectiveness? They will be 100% effective in telling you your mpg, but they won’t make a difference in fuel economy. Quote Link to comment Share on other sites More sharing options...
Wonga Spar Posted June 8, 2018 Author Share Posted June 8, 2018 (edited) I just noticed you said has anyone fitted an mpg gauge and wondered about effectiveness? They will be 100% effective in telling you your mpg, but they won’t make a difference in fuel economy. I should have been more clear would something like this fit to the Supra? https://frsport.com/autometer-9105-gauge-fuel-economy-2-rpm-mph-inst-avg-mpg-digital-obdii-ecome?currency=GBP&gclid=EAIaIQobChMI9qbPpdbE2wIVlvdRCh3msQe1EAkYBCABEgLu7vD_BwE Unfortunately buying a second car would mean the Supra would barely get used enough to justify owning it, and that's just not an option. Would rather bleed £300 a month on fuel than part ways with it. But paying £1,500 to get an ECU with some map options for MPG would pay for itself very quickly (although that's probably not a thing). Edited June 8, 2018 by Wonga Spar (see edit history) Quote Link to comment Share on other sites More sharing options...
jackso11 Posted June 8, 2018 Share Posted June 8, 2018 Can't improve what you can't measure! Sure you can. If you improve the mpg somehow it doesn’t matter if you know by how much, it is improved regardless. Quote Link to comment Share on other sites More sharing options...
Wonga Spar Posted June 8, 2018 Author Share Posted June 8, 2018 Hard to tell if driving behaviour has much benefit though without being able to get a readout. Running odemeter/fuel bills is a piss-poor way of measuring mpg. Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted June 8, 2018 Share Posted June 8, 2018 If the car is NA then you won't get much better MPG putting on an ECU. That said, you can get an LPG conversion kit and run the car on that. LPG is about half the price of petrol and you get similar performance. Quote Link to comment Share on other sites More sharing options...
Delboy52 Posted June 8, 2018 Share Posted June 8, 2018 I work 50 miles away from home so my round trip is 100 miles a day and this is how I do it. 1: Buy a 70mpg capable daily car. An LPG conversion on the Supra would give the option of cheaper fuel but not improve mpg by much like Mike says. It'd be cheaper to get a diesel something, tax it, insure it, spend only what you need to on it. Cherish the Supra for odd days and weekends. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted June 9, 2018 Share Posted June 9, 2018 If you were going to spend 1500 quid on an ECU, spend a grand on a Skoda TDI, get 60mpg and have 500 quid change. The most you'll ever see from a 2JZ is 28/30mpg Quote Link to comment Share on other sites More sharing options...
AC93 Posted June 9, 2018 Share Posted June 9, 2018 If you were going to spend 1500 quid on an ECU, spend a grand on a Skoda TDI, get 60mpg and have 500 quid change. The most you'll ever see from a 2JZ is 28/30mpg This! I bought a diesel as a daily... albeit a V8 twin turbo one. But a diesel nonetheless! Quote Link to comment Share on other sites More sharing options...
Dnk Posted June 9, 2018 Share Posted June 9, 2018 (edited) I'd have thought the cheapest route and keep your supra is fit Lpg Half the price of petrol, no second car to tax or insure or service A Top Prins kit is £1500 + installation which looks like £500 at one place i found Edited June 10, 2018 by Dnk (see edit history) Quote Link to comment Share on other sites More sharing options...
jackso11 Posted June 9, 2018 Share Posted June 9, 2018 Do you really want an LPG supra though? I know it will mean cheaper running costs but it just doesn’t seem right running a supra on anything other than the petrol it should. Quote Link to comment Share on other sites More sharing options...
Dnk Posted June 9, 2018 Share Posted June 9, 2018 (edited) Do you really want an LPG supra though? I know it will mean cheaper running costs but it just doesn’t seem right running a supra on anything other than the petrol it should. No but if it keeps you in the Supra rather than in a shitty horrid cheap diesel then its a no brainer in my book Plus do you really get 60 mpg out of one ? i had a low mileage SEAT Leon TDi, the official figures said it would but it never did no matter how i drove it Buying a cheap diesel or fitting lpg its going to take around a year if your doing 1000 miles per month before you start saving any cash Edited June 10, 2018 by Dnk (see edit history) Quote Link to comment Share on other sites More sharing options...
jagman Posted June 9, 2018 Share Posted June 9, 2018 Do you really want an LPG supra though? I know it will mean cheaper running costs but it just doesn’t seem right running a supra on anything other than the petrol it should. The LPI system (injected lpg) would not only provide cheaper running but increase power too , allows higher boost due latent heat of vaporisation and octane level - downside is small tank capacity , not a problem in this case and upper limit on power levels due limited injector availability ,again not a problem here It was available as an OEM alternative on Subaru and some Australian cars - made good power too another advantage is it runs clean and keeps engines internally clean of carbon Dutch company does it at fairly reasonable cost , not sure if the London emission charge is still zero with LPG , but as that is going up by £12 daily within the circular in a couple of years may be a big payback Quote Link to comment Share on other sites More sharing options...
jagman Posted June 9, 2018 Share Posted June 9, 2018 https://use.zerniq.nl/upload/www.vialle.nl/downloads/2479-6-ENG-LR.pdf Quote Link to comment Share on other sites More sharing options...
Ric Posted June 9, 2018 Share Posted June 9, 2018 im sure somebody on here had an LPG supra. cant remember the username Quote Link to comment Share on other sites More sharing options...
Dnk Posted June 9, 2018 Share Posted June 9, 2018 (edited) Or one that fits in the spare wheel well perhaps, can't re call the diameter or depth http://tinleytech.co.uk/shop/lpg-tanks/single-hole/single-hole-toroidal-tank-720x300-mm-96-litres-clearance/ Edited June 9, 2018 by Dnk (see edit history) Quote Link to comment Share on other sites More sharing options...
Tyson Posted June 9, 2018 Share Posted June 9, 2018 No but if it keeps you in the Supra rather than in a shitty horrid cheap diesel then its a no brainer in my book Plus do you really get 60 mpg out of one ? i had a low mileage SEAT Leon TDi, the official figures said it would but it never did no matter how i drove it Buying a cheap diesel or fitting lpg its going to take around a year if your doing 1000 miles per month before you start saving any cash I have a Megane diesel for my commute, claimed figure is 78 mpg combined and I average 53. That’s with motorway, city dual carriageway, normal roads and city driving with traffic so can’t really get more mixed than that. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted June 9, 2018 Share Posted June 9, 2018 The initial outlay for a decent LPG system would never be recovered in fuel savings Quote Link to comment Share on other sites More sharing options...
Dnk Posted June 10, 2018 Share Posted June 10, 2018 (edited) The initial outlay for a decent LPG system would never be recovered in fuel savings Never ? Prins kit fitted £2000 Based on doing 12000 miles p year 95 Ron per gall £5.85 at 25 mpg = £2808 LPG per gall £2.90 at 25 mpg = £1392 Diesel per gall £6.00 but at 50 mpg = £1440 Based on 18000 miles 95 Ron per gall £5.85 at 25 mpg = £4212 LPG per gall £2.90 at 25 mpg = £2088 Diesel per gall £6 but at 50 mpg = £2160 At 18000 miles the Prins kit has paid for itself Edited June 10, 2018 by Dnk (see edit history) Quote Link to comment Share on other sites More sharing options...
el_bandido Posted June 10, 2018 Share Posted June 10, 2018 My Supra had an LPG kit fitted when it was picked up. It was in the spare wheel well and was removed immediately. Quote Link to comment Share on other sites More sharing options...
jackso11 Posted June 10, 2018 Share Posted June 10, 2018 I have had my current supra for 9 years and not done 18000 miles in it yet. Quote Link to comment Share on other sites More sharing options...
Dnk Posted June 10, 2018 Share Posted June 10, 2018 I have had my current supra for 9 years and not done 18000 miles in it yet. The OP says he's going to be doing 50 mile round trip to work, say 5 days a week is 1000 per month so 18 months = 18,000 miles Quote Link to comment Share on other sites More sharing options...
Wez Posted June 11, 2018 Share Posted June 11, 2018 The 2JZGTE does run fairly rich in stock form, with an aftermarket ECU you can trim this right back, especially for motorway cruising where low load you can really lean it out Quote Link to comment Share on other sites More sharing options...
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