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Thread: Will the real gas mileage numbers please step forward

  1. #1
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    Default Will the real gas mileage numbers please step forward

    It has been a month of driving and I have finally refilled the tank on the 99 Suzi. It has a 2 inch lift with 23 inch all trail tires and a limited slip front differential. I calculated gas mileage at 22.95 mpg after converting from kilometers on the ODO. After getting it home I checked the oil and put in a can of Seafoam and filled it up with about 8 gallons of 85 octane. Most of my driving consists of 40-70 kph running about 5-8 miles per trip.

    I noticed that the fuel guage will not go to Empty but will hover just above empty when on fumes. The truck sputtered a bit this morning when starting so I put in about a quart to get me to the gas station.

    I will replace all fluids with synthetic and run another can of Seafoam and give gas mileage results in the future.

    As a side note I had someone ask about mileage today. I said it gets about 23 mpg. She was suprised because she was yet another under the impression that they got 60 mpg.
    Last edited by Shrimp Daddy; 05-29-2009 at 08:32 PM.

  2. #2
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    Sounds correct to me.

  3. #3
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    Ive only checked one truck out of about 40/45 and if my calculations from kms to mph were right I got apox. 27 mpg. That was putting around the ranch never reaching 4 th. gear. I drove about 90 miles that 3 day weekend. 30 miles was down the county road at one time. The truck was a Daihatsu 660cc 1997. So with that I would say 27 to 35 mpg depending on how you were driving. I think 35 maybe a tiny bit more would be safe to say if running in 4 th or 5 th and keeping speed at 40 mph+-. That 45 to 50 mpg is BS.

  4. #4
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    um i know some one thats has a 1990 hijet , i think 2wd and he gets 45mpg at best, and most of the time 30-35 city

  5. #5
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    hmm.. im not sure what my liteace gets but 250km cost me 18$ of diesel @ 89.9 cents/liter

    so 20L for 250km = 12.5km/liter
    so 156.25 miles and about 5.25 gallons(us) = 29.75 mpg highway? slight headwind and doing about 110 km/hr.
    SE Saskatchewan, Canada
    1992 Toyota Liteace - Mine
    1992 Subaru Sambar - Dad's

  6. #6
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    Default GasMileage

    Hi Shrimp Daddy
    I have been keeping track of the mileage on my Suzuki since February. It is a 4 speed, mostly highway driving at 90km/hr (55mph) on stock size tires so keep that in mind. There are also some wicked winds and long hills around southwestern Alberta and we all know how your foot goes to the floor in these types of conditions! I've had nine fills so far. Here are the results;

    Distance travelled
    2093km = 1300.5902 miles

    Fuel used
    194.071 litres = 42.69526 imp gallons = 51.268 us gal

    Average Mileage
    30.46 mpg imperial = 25.36 mpg us

    I've also used both premium and regular gas and found no difference in the mileage or noticable difference in the operation of the vehicle (but I've been told more than once that I may not be the most observant hubby ). The mileage has varied from a low of 27.18mpg imp (22.63 us) to a high of 35.32mpg imp (29.41 us).
    Jim
    1992 Suzuki Carry 4x4 4spd Diff Lock A/C, 42,000kms
    2008 Honda Element 4wd, 20,000kms

  7. #7
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    Talking mpg tables

    On my 89 Honda Acty here is the stats:

    total distance: 3977 km (2471.193 miles)
    total fuel: 75.34 gal us
    average economy: 32.8 mpg

    lowest mpg 21.19
    highest mpg 33.76

    I have done one tank of "hypermileing" (google it, no time to explain here) and had a tank at 55 mpg, but it is not too practical.

    Also remember, the Acty is an AWD so it has a little more driveline drag.

    The next inquiry shoud be questions/km

  8. #8
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    Hi
    i get 30-35mpg on the highway (depending on wind) and 40-45mpg in town (depending on how hard i drive it). our gallons are bigger in Canada then in the US os we can go farther on a gallon. no i don't have this backwards...the engine is reving at 6600rpm at 100kph o burns more fuel

    wyatt
    1992 Mitsubishi Mini Cab 4x4x4speed 12 valve
    1999 Ford F-150 SC 2x4x5speed
    2004 Suzuki Grand Vitara 4x4x5speed 24 valve twin cam
    nothing better then driving by stores and seeing my truck in the windows

  9. #9
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    No mention of this in the posts, but just curious. How are the Mileage readings being taken? From Odometer? Anyone verify w/ GPS how "off" their Odometers are due to; Larger tires, lifts, std error, etc.

  10. #10
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    My 1970 subaru 360 gets around 50mpg in town, it varies significantly from tank to tank (I have a fuel leak) but my lowest was 29mpg and my highest around 55mpg, fixed up I might be able to get 60mpg in town.

  11. #11
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    I also have a 99' Suzuki. It is a 5 speed with 4wd Hi/ Low, 2wd High. I run 175/70/13 wheels. Naturally my speedometer is off a bit now. I do not have a lift. After converting everything from Kph to Mph, I am consistently getting 28 mpg based on stock tires and factory calibrated odometer/speedometer. The larger tires and wheels give me more distance traveled per revolution and I have no noticeable loss of power. By using an online tire size calculator, I have estimated the amount of speed gained from up sizing from the stock 145/12 tires to the new size 13" tire/wheel combo to be almost a 12 percent increase. This equates to a speed gain of about 7 mph over stock. With that being said, my fuel economy should have increased at a similar gain. I am not sure how to know for sure without filling up my gas tank completely, then using a GPS unit to record the true distance traveled until empty, and then divide the total distance traveled by the gallons of fuel used to refill the tank again. This would be the most accurate, but I don't have a GPS. It would be a cool day trip sometime. I drive it at 55 mph on the highway most everywhere I go, so my calculations are based on this as well. When I bought my truck, I too was under the illusion that these trucks would get 45 mpg or more. Every mini truck dealer says so. I don't see how this is possible, at least with my truck anyway. I think that I am closer to 31 mpg actual fuel economy with the truck running faster at the same engine RPM. A win-win for highway driving in my opinion. My 06' 4x4 crew cab Silverado gets 17 mpg on average, so I drive my mini truck quite a bit and leave my full size in the garage most of the time. It's more fun to drive the mini truck anyway.

  12. #12
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    Over sized tires will cause your odometer to under-estimate your mileage. simple way to correct is. 20" tire to 25" tire == 25/20 = 1.25, Or 25% increase. If you say you added 12% simply add 12% mileage back onto the Odometer. then do the Miles/Gal from there. It actually works out where you can just take your MPG and add in 12% to make it easier. so if you are doing 55mph your really doing 55*1.12 = 62mph.

    I would guess that the Drag forces and poor torque of little motors makes for poo-poo mpg at 62 vs 55. IF you wanna "really" drive 55 drive 49. Add your 12% miles at the end of your tank and you have more accurate values.

    Many people put on bigger tires on a vehicle then complain about the fuel econ. In many cases (not all) their doing the math off a smaller "miles" number than they should and thus assume, Lift == poor mileage. Not totally true.

    More accurately said: Lift == worse drag coefficient. Worse drag coefficient worsened by the fact that they are driving around faster than they normally would b/c their speedometer is off (bad, and made worse by the drag forces being stronger cuz of the lift) and the fact that they are using a smaller miles number that what is real.

    Long story short. Once you realize this; drive x% slower based on the calibrated # (from gps or mile marker calibration) and add x% miles back at fill time.

  13. #13
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    I usually get around 37 mpg give or take a few miles
    Take care of everyone else and God will take care of you.

  14. #14
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    1990 subaru stock tires about 30mpg (can) in town lots of stop signs no traffic lights small town stop sign on every second street lol and 30 mpr is a suggestion the way i drive lol and driving highway 110 kph all the way edmonton home and 80 - 90 kpr up about a 2 hour trip 35 mpg (can) did not really notice a difference in dropping the highway speed milage wise used the speedo as the source for milage but i know it is out 1/10 k for every 5 k driven according to the "test your odometer" signs on the highway and as far as using premium fuel i agree no difference in milage or performance that would justify the extra cost and the premium fuel is a bad choice for canadian winters as it makes it harder to start on cold mornings esecially if not plugged in and it is more fun to drive than the old one ton but the ford does command more resect on the road
    91 sambar 83 ford 1 ton deck 88 chev extended cab long box 4x4 dead

  15. #15
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    Thanks o8K. I agree with everything that you are saying. Thanks for your help.

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