Fern Posted February 6, 2011 Share Posted February 6, 2011 Hi. I'm having 33x12.5x15 BFG KM2 as for now. And I think I have nothing more to do with my engine, double checked everything, replaced lot's of things, and I still have bad mpg. Currently it is 8mpg in town and around 10mpg on a highway. Also I do have a big roof rack which i think may play role in fuel consumption. Right now the tires are inflated with 2 bars and are very stiff on road. So my guess is maybe I want too much and it's usual fuel consumption with such tyres. Please, write your MPG if you have 3.9 petrol engine and 33" tyres and more. Thank you very much. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted February 6, 2011 Share Posted February 6, 2011 15mpg... Quote Link to comment Share on other sites More sharing options...
andy2986 Posted February 6, 2011 Share Posted February 6, 2011 3.9 auto Disco 11 ish on single point LPG and a mildly tuned engine Quote Link to comment Share on other sites More sharing options...
ThreeSheds Posted February 7, 2011 Share Posted February 7, 2011 Not quite what you asked - 32" MTs here - but: 10mpg on LPG, not checked petrol since I hardly use it Quote Link to comment Share on other sites More sharing options...
Fern Posted February 7, 2011 Author Share Posted February 7, 2011 Is it town or highway mpg that you mention here? Forgot to say I use multipoint LPG. I had 265/75/16 before and I had 9.4/11.76mpg. Lot's of people claim that they have 16/12mpg with standard tyres and I'm keen believe it. I would expect mpg decreasing with bigger tyres but not so much. Quote Link to comment Share on other sites More sharing options...
andy2986 Posted February 7, 2011 Share Posted February 7, 2011 Also don't forget that if you are doing your maths off the trip meter on the speedo (with 33's) your milage will read different to when you have 29" tyres. I found that , according to my GPS, 29 (std) = speedo read 5-7 mph to fast 32 = speedo read spot on 33 = speedo read to slow by about 3-4 mph Andy Quote Link to comment Share on other sites More sharing options...
Fern Posted February 7, 2011 Author Share Posted February 7, 2011 Sure I remember that. So I add 10% to milage on speedo. I've calculated that in theory and checked with GPS. Quote Link to comment Share on other sites More sharing options...
RoaryV8 Posted February 7, 2011 Share Posted February 7, 2011 all depends how you drive it really. im running 3.9 Auto RRC with 265/75 and driven sensibly i can get 12mpg normal driving, bit of town work buit mainly not stuck in traffic. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted February 7, 2011 Share Posted February 7, 2011 Crikey, that makes my 4.6 look good - 15mpg on average with 37's Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted February 7, 2011 Share Posted February 7, 2011 FF, you forget, you and I run a far more advanced fuel and spark system I'm on 33" Simex JT2s....winches, bumpers, full roll cage, autobox, oh, and did I mention 15 mpg was loaded up and pulling a trailer at ~1ton Quote Link to comment Share on other sites More sharing options...
Fern Posted February 7, 2011 Author Share Posted February 7, 2011 I feel like MegaSquirt will be my next purchase. I do not understand what 14CUX does not like. Quote Link to comment Share on other sites More sharing options...
tacr2man Posted February 7, 2011 Share Posted February 7, 2011 Not a discovery but 110 with 3.9i and 285/75r16 bfgMT big roof rack 14mpg on a longish run m/way at 60/70 . My 3.5 twin su disco gets 20 doing same run . Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted February 7, 2011 Share Posted February 7, 2011 If you have an autobox, and still running the 1.2 transfer box, you would do well to convert to a 1.4, makes the changes and TC lockup much more suited to the engine, more like stock. Quote Link to comment Share on other sites More sharing options...
monkeyb0y Posted February 7, 2011 Share Posted February 7, 2011 Moaning about my tdi only doing 27 with knoblys....think ill stay quiet....lol That's awful mpg.....don't remember rover v8s been that bad...what was book spec for these things when new? Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted February 7, 2011 Share Posted February 7, 2011 The only time I've cracked single-figure MPG was towing at about 6 tonnes all up mind you my gearing is quite low, perhaps that's the key. Quote Link to comment Share on other sites More sharing options...
TobyMellin Posted February 7, 2011 Share Posted February 7, 2011 once i fix mine this week, i'll do a few petrol mpg runs (town driving to & from work). i'll use the tomtom for the mileage. spec of car, for added weight etc. is: 3.9 efi with mark adams tornado chip k&n cone filter with safari snorkel lt77 std ratio diffs 285/75r16 bfg muds (32.8") arb front bumper with winch hd rear bumper full exterior cage with internal hoop rock & tree sliders Quote Link to comment Share on other sites More sharing options...
zardos Posted February 7, 2011 Share Posted February 7, 2011 Not quite what you wanted by a 3.9 on 35" in a 90 with roll cage, winches, etc 16mpg on motorway runs 8mpg around town 2gpm (0.5mpg) on a challenge event Quote Link to comment Share on other sites More sharing options...
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