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TDI Fuel Economy Discussions about increasing the fuel economy of your TDI engine. Non TDI related postings will be moved or removed.

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Old July 23rd, 2015, 08:42   #1
Wankel7
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Question Unexpected bump in mileage?

I haven't changed my driving style or anything on the car... just fuel.

I filled up with some premium diesel....they claim 50 cetane when I called them. I took a 275 mile trip and observed normal mileage. Mainly 60 to 70mph with two people using the AC. I hand calculated 47.5mpg.

I topped it off again and just put on over 650 miles. I haven't filled up yet but SG says I am averaging 57.5. I thought it might be SG having issues but I have never gotten more than 500 miles as the needle hit 1/2 tank. This time it was 570 miles.

Could a higher cetane cause this big of a bump?
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Last edited by Wankel7; July 23rd, 2015 at 08:48.
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Old July 23rd, 2015, 15:14   #2
GreenLantern_TDI
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Fuel Economy: Mid 40s
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Ive seen 4-5mpg increase from switching fuels before.
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