My Grandfather always had the "petrol book" in his car, and so that's how I learnt to do it.įuelLog on the Android is the "petrol book" I use now. There are a bunch of apps for smartphones that make it easier. or is there a different clearance people use? i've done some calcs based on my last fill up. Same run now nets me 61 with the K series. I used to get 45 mpg on a long run with twin 1 1/2's on an A series. Gunson gastester mk2 parts full#Obviously if you're filling up to the absolute limit as I often do the car needs to be parked on level ground and not going up or down big hills shortly after brim full fillingĪlso you want both fill ups to be at roughly the same weather temperature The tank still had over 2 gallons in it!Īs John says, you can do it more easily this time of year as much less likely to the fuel 'expand' and spill out because of heat build upįill right up until the petrol is in the top of the filler tube, have a very accurate measure of the mileage you do then refill in exactly the same way then simply divide the amount of petrol it took to refill to same level into the number of miles travelled The reason I say this is that my car had a problem where it started running out of juice after only a hundred miles or so and it turned out to be a broken tank pick up. Then you will know it's MPG with a bit of accuracy. Fill it to the brim, do a hundred miles in it and then see how much it takes to fill it up again. What you get to a tank isn't giving us enough info. The other thing is you must have the ignition timing set correctly and you MUST have a working vac advance! wihout the vac advance working correctly you will lose somewhere in the region of 10 to 20 percent, although that has a biger affect on longer runs. So how much do you need to put in the tank when you think it is empty. Unless you've left the handbrake on or something :) Sorry meant to also put you'd initially think of the carbs as the cause of such low mpg Gunson gastester mk2 parts manuals#If you keep on top of servicing, maintenance as per the Driver's Handbook (not manual) and repairs with workshops manuals then you should get lots more mpg and better overall performance of the engine and car overallĮTA: IIRC the original 1500 tanks were a nominal 7 UK gallons so unless the tank has been changed that's about 15 mpg! The only other explanation is fuel leak(s) Servicing including tappets, timing and carb set ups should either cure or find your problem What you get out of a tank isn't an accurate measure but 100 miles sounds very poor indeed Of course, apart from your tuning state it depends how much wellie you give to the pedals. I havn't checked this yet as it was not the reason for the change. I've recently switched to a single HIF44 and been told up to 45mpg is possible. With standard 1.25 carbs I was getting 25/30mpg(rural roads). Assuming that they are of a similar size that means you are getting circa 17mpg! Not sure how big a 1500 tank is but a 1275 is 6 gallons. but is there anything else I should be wary of? I will fix those (when I get a chance) and then see. Fuel leak (possible - will be checking perished pipes) Idling too high (it is - need to sort that)ģ. and I expected better fuel economy than I'm getting. MG Midget and Sprite Technical - Fuel Economy I've been driving my 1500 for a few months now.
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