Need a gut check on recipe.

Pumpkin Beer
Brew Type: All Grain Date: 9/9/2008
Style: American Amber Ale
Batch Size: 6.25 gal
Boil Volume: 8.68 gal Boil Time: 90 min
Brewhouse Efficiency: 75.00 %

Brewing Steps Check Time Step

-- Measure ingredients, crush grains.
-- Prepare 10.37 gal water for brewing

Amount Item Type
9.50 lb Pale Malt (2 Row) US (2.0 SRM) Grain
2.00 lb Munich Malt (9.0 SRM) Grain
0.50 lb Caramel/Crystal Malt - 40L (40.0 SRM) Grain
2.00 lb Amber Dry Extract (12.5 SRM) Dry Extract

Mash Ingredients
Mash In: Add 15.00 qt of water at 166.6 F
60 min - Hold mash at 153.0 F for 60 min
-- Drain Mash Tun
-- Batch Sparge Round 1: Sparge with 3.31 gal of 168.0 F water.
-- Batch Sparge Round 2: Sparge with 3.31 gal of 168.0 F water.
-- Add water to achieve boil volume of 8.68 gal


Boil for 90 min Boil

Ingredients:
Boil Amount Item Type
90 min 60.00 oz Pumpkin (Canned) (Boil 90.0 min) Misc
60 min 2.00 lb Amber Dry Extract (12.5 SRM) Dry Extract
60 min 1.00 oz Hallertauer, New Zealand [7.00 %] (60 min) Hops
30 min 1.00 oz Goldings, East Kent [5.00 %] (30 min) Hops
15 min 1.00 tsp Irish Moss (Boil 15.0 min) Misc
10 min 1.50 tsp All Spice (Boil 10.0 min) Misc
10 min 1.50 tsp Nutmeg (Boil 10.0 min) Misc
10 min 2.50 tsp Cinnamon Stick (Boil 10.0 min) Misc

-- Cool wort to fermentation temperature
-- Add water (as needed) to achieve volume of 6.25 gal

Amount Item Type
1 Pkgs British Ale (Wyeast Labs #1098) Yeast-Ale

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Anyone have any input on this recipe. It's not 100% mine as I mixed what I learned when doing Yuri's Thunderstruck Pumpkin Ale and a recipe I haven't tried yet by RichBrewer.

I'm curious about head retention on this recipe. Thoughts?
Basically, I'm hoping for a solid Amber Ale recipe with a spiced pumpkin twist.

Thanks all for your advice.

RichBrewer's recipe is fabulous. Even though I haven't bottled it, it's sitting in the secondary do a little last minute clearing.

I will tell you from experience though, if you are boiling the pumpkin, you will lose a ton in your primary.

Yeah, this will be my second pumpkin all.
I'm figuring on about 5 gallons in the end...that's why I wanted a 6.25 gallon batch.

Cool, I hope it turns out well. I am not a pro, so I can't comment on your recipe or the head rentention. .

Well...I completely missed my OG. I second guessed my self when I started looking at the recipe and decided to skip the DME because BeerSmith said that my OG would be really high.

I forgot to change the batch size on it so I screwed up. Then to add insult to injury I didn't get enough boiled off.

Ultimately, I came in about 20 points low.
I'm going to do some research but what effects other than lower ABV will this cause?