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View Poll Results: 70 mph miles per gallon?
42 3 20.00%
44 0 0%
46 2 13.33%
48 1 6.67%
50 2 13.33%
52 0 0%
54 0 0%
56 2 13.33%
58 0 0%
60+ 5 33.33%
Voters: 15. You may not vote on this poll

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Old 01-09-2020, 12:55 PM   #41 (permalink)
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Quote:
Originally Posted by racprops View Post
The twin-turbo Jaguar XJ was rated at 35MPG and has a 18Gal Tank.
One note: That's 18.7 Imperial gallons, or 22.5 US gallons. To get 1,000-mile range out of the XJ, you would need to get just under 45 MPG (US).

I saw that Opel at the LeMay storage campus three years ago; I'll have to see if I can dig up my pictures.

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Old 01-09-2020, 01:20 PM   #42 (permalink)
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One side will argue against big heavy tanks until Tesla builds the Cybertruck then suddenly they will be the ones pulling that line with their trucks.

My Touraeg TDI with a 26.4 gallon tank and the ability to get 40 mpg (not at 70 mph though) has over a 1000 mile range.
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Old 01-09-2020, 01:49 PM   #43 (permalink)
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Pretty sure that Opel is misrepresented and is part fraud, in that I think they are burning crankcase fumes to the point where it would run or nearly run with an empty fuel tank.
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Old 01-09-2020, 05:01 PM   #44 (permalink)
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Depends on the trip and conditions but 70+mpg in the summer at 70mph. 55+mpg to the tank at 80mph. I managed to get a hair over 60mpg on a tank one time driving 80mph throughout the tank but it was hot, no air conditioning running, high altitude in the desert. 2000 Honda Insight 5-speed in 2nd overdrive.

More details about high speed MPG in the Insight - Same 3600 mile trip driving at whatever speed I needed to keep lean-burn engaged was 73mpg, just a hair under 50 gallons but I don't know the average speed for that run but most of the time the MPG gauge was showing 75 but hills require dropping out to lean-burn to hold reasonable speed but a solid amount of the trip was in the 70-78mph range(mostly on the lower end of the range though). Driving the same trip last year at the speed limit instead of driving for MPG and I burned 60 gallons(60mpg) the route is MN south on 169 for a short bit with variable speeds, west on I90 (70 in MN, 80 in SD), continued through a bunch of Wyoming two lane highways that I forget the speed of but I know a few spots I was driving 80 speed limits, 75 or 80 on I80 in Wyoming and Utah, I think 80 in Nevada but not sure. I drove 80 in a Prius and it got 42mpg in the similar conditions that my Insight gets high 50's to 60mpg.
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Old 01-10-2020, 04:26 AM   #45 (permalink)
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My insight cant lean burn up to 70mph.. but I get about 75mpg@61mph. (Fastest I could go while maintaining lean burn in 5th gear.
35psi re72 tire, 0w-16 oil, no aero mods. There's a lot of gains to still be had
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Old 01-10-2020, 03:34 PM   #46 (permalink)
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The only problem I see with half of these diesel cars is 1. Imperial gallons and 2. Diesel cost 15% more than gasoline. So for all the euro diesel guys multiply 45 mpg by 0.72 and that would be how it compares here in freedom land. (About 32.5 mpg gasoline usa equiv)
Also, none of your cars pass USA emissions test.
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Old 01-10-2020, 04:41 PM   #47 (permalink)
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46-48 MPG at 70 MPH on flat ground. 2013 Ford Fiesta SE sedan 1.6L manual. Non-Eco tires at 44psi, no other mods. 2 people and about 150 lbs of cargo.

Averaged 50.2 mpg (indicated) on my trip from Vancouver WA to Renton WA (one way) over Christmas break. I was very happy to break 50 mpg for the first time. I was driving at 65 mph when I didn't have a semi to tail, then tailing semis at a 2.5-3.0 second following distance going 65-70 mph when I could. My display reads about one MPG optimistic, so I probably got 49 MPG in reality. Hit traffic on the way back home and finished out the tank with 47 MPG indicated, forgot to check actual mileage when I filled it up

I typically get 40-42 MPG around town (country roads plus some city driving). If I drive it like a "normal" driver it gets 35 mpg around town, or 30 if I use the AC and drive it "normal"

Last edited by Pressingonward; 01-10-2020 at 04:42 PM.. Reason: specified sedan
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Old 01-10-2020, 08:34 PM   #48 (permalink)
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Quote:
Originally Posted by Frank Lee View Post
Pretty sure that Opel is misrepresented and is part fraud, in that I think they are burning crankcase fumes to the point where it would run or nearly run with an empty fuel tank.
My thoughts too. I had never heard of it until I came across it at the warehouse, and subsequently looked at their website and tried to find out what I could about the 1973 Shell competition. Nothing. The website for the car says it was a minimum 30mph contest, but nothing about distance, allowed driving techniques, conditions, modifications, or other competitors. So even if it did get 300+ MPG, we have no way in which to judge that against any other car. (It reminds me of Toyota's publicity stunt at the 'ring, claiming 600+ MPG from a plug-in Prius, a few years ago. Maybe that car will show up in a collector's garage 40 years from now with a similar tale of fuel economy magic).
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Old 01-12-2020, 11:58 PM   #49 (permalink)
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Quote:
Originally Posted by Coreyosaur View Post
My insight cant lean burn up to 70mph.. but I get about 75mpg@61mph. (Fastest I could go while maintaining lean burn in 5th gear.
35psi re72 tire, 0w-16 oil, no aero mods. There's a lot of gains to still be had
I assume you mean RE92 in the stock size, raise the tire pressure for better MPG. You should be able to lean-burn at 70mph on the flat with air conditioning compressor off in warm or hot weather. 61mph should not be the limit.

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