Hey - did you know if you click on the title of a thread it will take you to the first unread post since you last visited that thread?
but were afraid to ask: 
STOP!! Never post your email address in open forums. Bots can "harvest" your email! If you must share your email use a Private Message or use the 
smilie in place of the real @
Pretty Please - add it to our Events forum(s) and add to the calendar! >> 
William Mapstone
Member
Offline
When properely tuned, what kind of mile per gallon can I expect from my 68 spitfire. Thanks!
-
Hi Guest!
If you appreciate British Car Forum and our 25 years of supporting British car enthusiasts with technical and anicdotal information, collected from our thousands of great members, please support us with a low-cost subscription. You can become a supporting member for less than the dues of most car clubs.
There are some perks with a member upgrade!**Upgrade Now**
(PS: Subscribers don't see this gawd-aweful banner
Spitfire fuel economy for 68 spitfire
- Thread starter William Mapstone
- Start date
Share this page
Offline
I would expect anywhere from mid-20s to low-30s.
OP
William Mapstone
Member
Offline
thanks andrew.
Would switching to a newer designed carb increase the fuel economy? With gas prices rising, I wanted to make the triumph my everyday driver during the spring,summer,fall, and was hoping to get closer to 40 mpg. Considering the low weight and low hp of the triumph, I figured getting close to 40 mpg should be possible?
Would switching to a newer designed carb increase the fuel economy? With gas prices rising, I wanted to make the triumph my everyday driver during the spring,summer,fall, and was hoping to get closer to 40 mpg. Considering the low weight and low hp of the triumph, I figured getting close to 40 mpg should be possible?
Offline
At the expense of power, it's possible that a single Stromberg setup from a later Spitfire might boost the economy a bit. What might help more would be more expensive: going with a lower numerical differential (3.89:1 from later US-spec. Spitfire or even 3.63:1 UK-spec diff from a 1500) would cut the revs and likely boost economy. Still more expensive would be addition of an overdrive gearbox. But I seem to recall that some of the later (and much heavier) Spitfires were easily capable of mid-30s or more when OD equipped.
Or don't ever drive much over 40 mph (but that's not a realistic option unless they revive the Mobil Economy Runs)! /bcforum/images/%%GRAEMLIN_URL%%/driving.gif
Oh, as an additional data point: my '62 Herald 1200 sedan, probably about 100 lb. or so heavier than your Spitfire and with a smaller and less powerful engine (single carb.), will easily do 30-35 mpg depending on conditions.
Or don't ever drive much over 40 mph (but that's not a realistic option unless they revive the Mobil Economy Runs)! /bcforum/images/%%GRAEMLIN_URL%%/driving.gif
Oh, as an additional data point: my '62 Herald 1200 sedan, probably about 100 lb. or so heavier than your Spitfire and with a smaller and less powerful engine (single carb.), will easily do 30-35 mpg depending on conditions.
Geo Hahn
Yoda
Offline
Andrew Mace said:
This past weekend we took our first long (1000 mile) road trip since installing an OD in the TR4. Outbound was 2-lane roads at 55-60 mph, coming home was 75 mph interstate. Average for the trip 34.6 mpg with the slower outbound trip delivering just under 40 mpg.
Wow at this rate I'll be paid back for that overdrive unit in just... 170,000 miles.
Still, I have to declare it is worth it.
Offline
But don't forget to factor in the cost of at least one set of rings, bearings and gaskets that you'll NOT have to replace now that you're keeping the revs down.... /bcforum/images/%%GRAEMLIN_URL%%/grin.gifGeo Hahn said: