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post #11 of 24 (permalink) Old 07-25-2018, 05:30 PM
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My '09 451 (pure coupe with 15" BRABUS wheel swap) averaged between 38 and 42 pretty much no matter how hard I did or didn't drive it. Up and down the grapevine in SoCal for years at one point, 5x's a week, and still averaged 42 highway with the car.
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post #12 of 24 (permalink) Old 07-26-2018, 02:50 AM
 
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Aerodynamically, there's no way a Smart Car can get 40MPG at 80MPH... My Scanguage tells me as much (and yes, I have checked it's averaged readings against the fuel pump gallons delivered). Maybe if you drafted a semi going down the highway, but then they don't cruise that fast. But, I noted that there's a marked increase in fuel efficiency if I slow down to 60 MPH, which might get me into that MPG ballpark (my Scangauge would read in the high 30's)... Unfortunately, that's too slow for traffic in my typical routes. Drivers are far too impatient and will ride your ass in the slow lane if you drive at 60...Upping the tire pressures didn't help the MPG's, but driving with the windows closed did. I'm lucky to get 30MPG at the cruising speeds out here normally aspirated (no turbo). On the tollroads, it's literally pedal to the metal -- right against the downshift switch -- the whole way... I might upshift into 5th to lower the revs a bit and save gas, but that's about it... And, that's sitting in the slow land being passed by practically everything -- Ford Transits, MBZ Sprinters, diesel pickup trucks, Daewoo's, you name it. The lowest MPGs I ever had was between 18 and 19 boosting to 1Bar when I had a SFR Stage III turbo installed. Even then, I could be right up against the speed limiter and still get passed by gardeners in their little mini pickup trucks -- rakes and week whackers flapping in the wind... Still, I really miss that turbo -- had to remove it for smog inspection when the car reached 6 years old... Alas, my "new" Smart 451 (got it with 42 miles on the clock) was registered by Car2Go San Diego back in 2015, so even "new" Kalifornia thinks it's a 3 years old car. I'm hesitant to install the turbo on it as I'd have to remove it in just a few years for a smog inspection.... In some states, engines under 1 liter are not subject to any inspections... Alas, Kalifornia isn't one of those states...
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post #13 of 24 (permalink) Old 07-26-2018, 07:45 AM
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HI GUYS
So what is the plug number so I know what to buy? NGK copper?
I'd love to get 40 MPG. My best so far is 30-35 without air. and I just changed to "idiot"plugs. with no better than what it had in it which was "idiot" as well. Hmmm, that's what I get for following other recommendations.

Last edited by NedleyC; 07-26-2018 at 07:47 AM. Reason: wrong numbers
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post #14 of 24 (permalink) Old 07-26-2018, 07:59 AM
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The NGKs I'm using are LKR7B-9.
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post #15 of 24 (permalink) Old 07-26-2018, 08:14 AM
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Why Thank You jwight. I'm going shopping, and changing.

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post #16 of 24 (permalink) Old 07-27-2018, 07:04 AM
 
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My worst MPG.............

Was a fill up with stated 91 octane,from Sam's Club. It had a VERY HIGH percentage of ethanol. Only averaged 30 to 32
MPG for that tankfull. Went back to Shell 93 octane and 40+MPG..................
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post #17 of 24 (permalink) Old 07-27-2018, 08:15 AM
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BOY OH BOY You hit the nail on the head with Sams. Both of my cars show a much lower MPG with there gas. THANKS ALOT. A good lesson learned.
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post #18 of 24 (permalink) Old 07-27-2018, 11:56 AM
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I usually get 40 -42 with Shell premium and 36-38 with Exxon premium. Regretably, my local Shell station is now a Walgreens so my lifetime (10+ years) mileage of 40.6 is dropping. It's been around 38 over the last 10 fill ups.
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post #19 of 24 (permalink) Old 08-05-2018, 11:15 AM Thread Starter
 
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Well I decided to change the brand of fuel I was buying and took the car on my very first road trip.

I drove 230 miles on 4.5 gallons of fuel.


So I'm going to guess the company I normally get my fuel from is just junk. Because i didnt change a thing on the car or drive any different than normal. 70-75 for the most part of the trip.
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post #20 of 24 (permalink) Old 08-05-2018, 06:10 PM
 
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Would agree that hwy + A/C = lower mileage. I did a run from Toronto to London Ont a couple of days ago and was averaging 120 kph with a couple of faster short bursts. Half a tank took me just under 300km or 186 miles at speed. Was cycling my A/C on and off as it was one of those muggy days where I needed to knock down the humidity but things would get too frigid.
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